You know how when you're in a crowd, you can tell whenever someone says your name? Well, some villains can do that anywhere.
The core trope is that saying the name of the villain summons him. Rarely, though, is he summoned surprised and vulnerable; be assured that saying the name of this guy is a bad thing. Though probably just for you; he'll usually disappear afterward. The question of why everyone in the world often knows this name, despite the massive taboo against saying it, is rarely addressed.
This makes talking about the villain problematic, as he has to be referred to as "The Enemy" or "He Who Must Not Be Named" or " You Know Who", or possibly just by a nickname, as with Satan, who may be called "Old Nick" or "Mister Scratch" (or Louis Cypher). Sometimes these nicknames are conspicuously positive, just in case they're listening anyway, as with The Fair Folk, because you do not want to face down a pissed-off faerie. If referring to him by any name summons him, well, then you're just screwed.
If attempting to talk to someone not in the know, this can easily lead to Poor Communication Kills. There also always remains the possibility of someone slipping up (especially when surprised or caught off-guard), or someone not in the know saying it. If you have another enemy you want to deal with, though, perhaps you can trick him into saying the name.
Another variation is that the villain's name must be said multiple times to summon him. In these cases, saying the name once is safe, so you probably don't need to worry about
summoning him accidentally, or being tricked into doing so (unless you have no idea what's going on and just come across a piece of paper saying "Say Hastur 3 times.") (Okay. "Hastur three times.") Instead the villain is essentially Sealed Evil in a Can, and he'll be summoned either by someone who has no idea what's going on, or by someone who got his tropes mixed up and thinks he'll be able to control the villain this way, or at least bargain with him. Expect this guy to die horribly. Also expect this villain not to disappear.
The name comes from the old saying: "Speak of the Devil, and he will appear." Also known as He Who Must Not Be Named.
If saying the villain's name doesn't necessarily summon him, but may simply cause something bad, that's The Scottish Trope.
If knowing someone's true name instead gives you power over him, that's I Know Your True Name. If summoning him is not a bad thing, see Call On Me. See also Inadvertent Entrance Cue. When this is done for humor rather than being a supernatural ability, it's Right Behind Me. Related to the Sneeze Cut. When this is invoked for a murder, a Trouble Magnet Gambit is very likely the method used. Candle Jack was a recent pop culture variation. Thanks for the mention.
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The Rail Tracer in Baccano! is something of a triple subversion. At first, it's pretty obvious that it's a relatively harmless Urban Legend delivered by two Cloudcuckoolanders and a chirpy train conductor that had the misfortune of coinciding with a train hijack. Then episode 6 rolls along and shows the aforementioned hijackers getting picked off by this...thing, proving that it just might be Real After All. And then comes the Wham Episode (Let's just say that it's a really bad idea to give the aforementioned chirpy train conductor/part-time Psycho for Hire a reason for a Roaring Rampage of Revenge)...
A subversion and running gag on Dinosaur King: Ursula always knows when someone calls her an "old lady" no matter where they are in the world and immediately, and loudly, takes exception. She won't know where you are, much less be teleported there, but she will be pretty P.O.'ed when she meets up with you. This was once used to determine if the Alpha Gang was in the area.
In the season 2 premiere of Gundalian Wars, Ren makes a law that forbade to speak of where Void 4's powers come from. A Gundalian says Pre-cure, and Void 4 wreaks massive havoc on Gundalia.
In The Sandman, characters refer to the Furies as "The Kindly Ones", as the ancient Greeks did; in this case, it's also to avoid attracting their attention.
Also in The Sandman, there is one instance of summoning the title character by saying his preferred name (Morpheus). The character Rose Walker is given a piece of paper by her protector, Gilbert, and told that she must read the word aloud if she finds herself in grave danger; she reads it when another character attempts to rape and murder her, causing Dream to appear in the room and come to her rescue. It's not made clear why this works, however; it may be because Gilbert is actually a resident of Dream's kingdom, who has wandered off to do his own thing in the waking world, and is utilizing his own connection to Dream on her behalf. It is equally possible that it worked because Rose herself is the granddaughter of Dream's younger sibling Desire, and thus a blood relative of the Endless.
Though remember that Glob warns Brute not to say the name "Morpheus", because that could give him immediate entry to their sanctuary. Otherwise, Morpheus needs to take the long way around. Again we have dream creatures involved, so it is hard to say what would happen if a mortal said it under normal circumstances.
In the story Ramadan, the Kalif of Bagdhad gets Dream's attention by addressing him by name and then threatening to release a horde of demons if he doesn't show. It seems that he knows where anyone is talking about him but doesn't have to take an interest, which suggests that Gilbert, as one on the Major Arcana, the greatest dreams, knew a name for dream most mortals don't and that made him take an interest.
In the spinoff series Lucifer, the eponymous protagonist threatens the queen of the Japanese afterlife who has been using the souls of living dreamers to punish the ignoble dead, which is apparently seen as "poaching" with Dream as the gamekeeper with calling on the Dream King by merely saying his name. Since we know Lucifer doesn't lie but Morpheus died, and Daniel is now King of the Dreaming we know that it's probably true, but not how it works, since Dream claims to no longer be Daniel Hall.
In Young Avengers, Kang the Conqueror references this trope, and sort of uses it.
A heroic version, The Phantom Stranger occasionally waits to show up until someone says the word "stranger". This is less of a summoning issue, and due more to the fact that he has a sense of dramatic timing. This has, needless to say, been lampshaded and parodied.
Zatanna: Stranger things have happened.
Phantom Stranger: Did someone just use a sentence involving the word stranger?
In Brazilian comic Monica's Gang, two characters have it: LadyMcDeath appears whenever someone says "death" or something related to the verb "die"; and whenever something absurd occurs and someone asks "who would be nutty enough..." Nutty Ned appears.
A more down-to-earth version of this is used for humor and to get around a real-world problem in the G.I. Joe comics. Hasbro created a character named Ghostrider, who is a stealth pilot. Nobody noticed that there was already a character in Marvel Comics with almost the exact same name before the figure went into production. Larry Hama worked around the issue by writing the character as being so stealthy that even his own teammates could never remember his codename.
In Zot! the assassin-for-hire 9-Jack-9 can be summoned by typing his name (actually spelled J9AC9K) into any computer terminal. Every single reader has tried it at least once... or considered it and then chickened out.
In an issue of Wolverine, it was revealed that perennial X-Men villain Spiral is aware (or alerted) whenever anyone anywhere mentions her. She used this to track Wolverine and Mystique, the latter of whom could not spit out the warning in time.
Parodied in the Alcatraz Smedry verse, where there is a Librarian general called "She who cannot be named", but they are being literal; it isn't unwise to say her name, but nobody except Al's Badass Grandpa can actually pronounce it.
In The Belgariad, saying the name of Zedar allows him to listen in on your conversation. The protagonists eventually get around this by getting lots of storytellers to retell the tales of Zedar, so he won't notice them amidst all the noise.
In Robert W. Chamber's The King in Yellow, "Hastur" was originally a mysterious name, most likely a location, with only vague connections to the titular King. When August Derleth absorbed Hastur into the greater Cthulhu Mythos, he started using it as the actual name of The King in Yellow, and re-appropriatednon-synonymous titles such as "Him Who Must Not Be Named," (likely another euphemistic name for Azathoth) and "The High Priest Not To Be Described" (a minion of Nyarlathotep who might actually be Nyarlathotep) as sobriquets. This spawned the idea in the Expanded Universe that referring to him in by name was a very bad idea.
In particular, the 1980 Dungeons & DragonsDeities and Demigods Cyclopedia stated that naming Hastur aloud could result in his sending some Byakhee to kill you. If they failed, he might appear himself to finish the job. Tricking a player into doing so has long been a favorite means of ending a game that has gone sour.
Not a bad thing but in fact quite good: In Persona 2, saying "Hasturcomeforth" instead of your birth month to a fortune-telling girl would freak her out immensely and let you eventually summon him. (Hastur just loves hearing his name, basically.)
In the Web ComicUser Friendly, Kuan is singing the Badger Song and Sid, annoyed, gives him a Lovecraft version to sing, substituting "Hastur" for "Badger". It looks like Kuan was Killed Off for Real as a result.
Someone has coined the term "hasturbating" to refer to the process of invoking this meme.
In the Incarnations of Immortality series, mentioning Satan by name will draw his attention. Lachesis and Chronos both mention this to the new incarnation of Death, when Death is investigating a suspiciously premature demise.
Author Ramsey Campbell created a god for the Cthulhu Mythos named Y'Golonac *
You fool! You've doomed us all!
, who could possess a host if they merely read his name. Not even out loud; he could possess a person if they sight-read his name on a printed page. Seeing as he's a god that represents every deed that could be viewed as defiling by individuals both sane and insane across the universe, this is not a pleasant fate.
Well, it's not clear whether merely reading the name or reading out of De Vermis Mysteriis will turn you into a slave of Y'Golonac.
The accepted version is that reading his name is fine unless you are reading his name from one of the 7 tomes of "The Revelations of Glaaki" which will cause him to appear and either eat or mind rape or enslave you.
In The Wheel of Time series, saying The Dark One's true name Shaitan supposedly draws his attention, and certainly gives you a nasty fit of bad luck. He's the dark god, you know. So there exist many alternate names for him too - like "father of lies".
Used in Jonathan Strange & Mr Norrell with the Raven King, a human raised in faerie who is the bringer of magic to England, and who is considered the true ruler of those living Oop North who often make oaths by him. One Northerner, Childermass, declares himself loyal to the Raven King despite his absence, and later is shocked when he meets him and it's clear that The Raven King heard the oath and is at least mildly amused that Childermass has no idea who he is
In the Harry Potter series Voldemort is literally called He-Who-Must-Not-Be-Named by those who are afraid of saying (or printing) his name, though those using less formal diction call him You-Know-Who. His followers simply call him The Dark Lord. In the earlier books this is portrayed merely as people being monumentally afraid of Voldemort (and a sign of reverence, in the case of his followers). In the last book Voldemort uses this to his advantage by placing a "Taboo" spell upon his name which causes the speaking of his name to break any protective charms on the area and reveal the location of the speaker to him. Seeing as the only people with the nerve to speak his name are Harry's group and (probably) The Order Of The Phoenix, this is quite clever.
In a more benign case, house elves automatically Apparate to the location of their owner when their name is called, regardless of any curses or protective magic that should prevent them.
In the Young Wizards series, speaking any of the Lone Power's nicknames has the danger of drawing Its attention. Even thinking its true name is guaranteed to get Its attention unless something is keeping It distracted.
In the Discworld book Lords and Ladies, it is mentioned that mentioning the Elves by name can draw their attention and even help them cross over from Fairyland, especially around certain times of year when crop circles appear. For this reason, the witches of Lancre refer to them by various pseudonyms (such as the Gentry, or the Lords and Ladies), and only feel (barely) comfortable saying their name aloud when in the presence of lots of iron. Although if you're close enough to a portal, even these pseudonyms will draw them. (This is actually based on old folk beliefs; there's a reason the trope's called The Fair Folk.)
Another Discworld example is Igor (any Igor). When the master calls him, Igor will appear directly behind to answer. Makes no difference if Igor was in the basement or on the roof at the time, somehow he will also be out of sight behind his master when the master calls. Just part of the Igor service package.
Yet another Discworld example, especially in the early books such as The Colour of Magic, was never mentioning the true name of The Lady, the Goddess Who Must Not Be Named, which is Lady Luck. An inversion, since she's the only goddess who only comes when not called and flees when mentioned. The Discworld Companion adds that the Gamblers' Guild once tried worshipping her, and the result was that the building exploded. Not so surprising, since it is later established that Gambler's guild is always right across the street from Alchemist guild...
Inverted with the Auditors, which are instantly destroyed if they refer to themselves in the first-person singular.
Wizards are forbidden from saying the number eight because it draws the attention of the Eldritch Abomination Bel-Shamharoth, the Sender of Eight.
Lord of the Rings offers a sort of half-example; the words "Sauron" or "Mordor" are often avoided, but it's never made clear what, if anything, the consequences of using them are.
There is also a case of inconsistent narration, since in the Fellowship of the Ring Aragorn claims that Sauron doesn't use his given name, and forbids his servants speaking or writing it (not really surprising when Sauron is elvish for "Abhorred"), but in the Return of the King we encounter a character called the Mouth of Sauron, who explicitly calls his master "Sauron the Great".
He might have been using the name for the benefit of the people he is talking to, since that it is the name they recognize for him. His original name of Mairon would not really have meant anything to the people of middle earth. Though it would have been funny to see the mouth refer to "Mairon The Great" only for Aragorn to reply "Who?".
Sauron was known by that name in Númenor (as the Númenóreans knew him from the Elves) and the Mouth of Sauron was a Black Númenórean, so he might have been using the name out of habit. Also, the taboo about not mentioning Sauron's name seems to be mainly a Gondorian thing ("He whom we do not name" or "the Nameless Evil")
This trope is used often in the books: Gandalf is unwilling to pronounce the ring's verse in the dark, especially in the black speech. There is generally a reluctance from all the characters to use words or names associated with evil things when it is dark.
Since the Ring's verse is essentially an evil spell, it's quite understandable why Gandalf doesn't want to speak it in uncontrolled circumstances.
Similar to The Lord of the Rings, the Chronicles of Thomas Covenant has the Ranyhyn, the wild, free and intelligent horses. They have special magic that days or weeks before you call them, they know it and head for where you will be so that as soon as you whistle for them, they are there.
And in the Second Chronicles we meet the Sandgorgons, who instantly know when their names are mentioned, even a great distance away, and will run at incredible speeds to find the person who did it and kill them.
A rather literal variant in the Thursday Next series, Acheron Hades can hear his name if it's spoken within a hundred-mile radius.
In Snakecharm, the second of Amelia Atwater-Rhodes' Kiesha Ra series, an unfortunate falcon, masquerading as a serpent, asks Zane if the falcons' ambassador, Syfka, is in town. Syfka pops up almost immediately, telling the rogue falcon "You were foolish enough to use my name, not once, but twice." The "...And then you're in deep trouble" aspect is subverted, as Syfka gets into a heated argument with Zane, and when she turns around a moment later, everyone realizes that the man who said his name had run away during the argument.
In Romance of the Three Kingdoms, Cao Cao had a tendency to show up whenever his name was being mentioned - so the saying goes, "Speak of Cao Cao, and Cao Cao is at the gates." Ironically, at one point, this was happening to the man himself - everytime he tempted fate by mentioning some character on the opposing side, that man would shortly show up.
Similar to the Sandman example above in the Percy Jackson and the Olympians series by Rick Riodan, the use names of various mythological figures or places causes bad things like thunder and darkening of the skies to happen, so the characters tend to avoid using them.
It's stated that this is because it gets their attention, and the lightning is only if they're upset with you.
Unless you're Dionysus, who responds to Zeus's thunder with a bored "Blah, blah, blah."
Mentioning the skinwalker/naagloshii in Turn Coat is a very bad idea, since it grows stronger with fear and infamy. So Harry renames it "Shagnasty," which lacks the same intimidation factor. Also, only a mortal can summon an immortal being, since only mortals have freedom of choice. Unless you use the entity's True Name, the summoning does NOT grant any power over the individual, and the individual will remember you summoned it. Of course, Harry being Harry does this with several high ranking Fae, providing him with very interesting times in later novels.
In the Evie Scelan series, Evie threatens people who seem like they are about to call the Bright Brotherhood by their proper name, Fiana. For someone who doesn't mind handing out her true name, she seems surprisingly worried about this.
In Jack of Shadows, by Roger Zelazny, Jack's powers include the ability to hear any person who speaks his name in shadow, and to continue listening in until they move out of it.
Jack Chalker's The Changewinds begins with the female protagonists learning that they are being threatened by an evil wizard. A mercenary to whom was entrusted the girls' safety decides that the villain is likely to pay better and attempts to attract his attention by saying his name now and then. The girls, discovering this, try to call on the wizard who brought them to this world by saying his name over and over. Of course, with a name like "Boolean", the girls just wound up giggling after a while. It should be noted that neither wizard was summoned, no matter how much their names were dropped.
From the Notebooks of Dr. Brain by Minister Faust, heroes are paranoid about mentioning the name of a ridiculously powerful psychic supervillain because saying his name aloud allows him to instantly teleport to your location. This is despite the fact that he's been locked up and contained for over two decades.
Doctor Who has taken to a variation of this trope as of late with nearly every episode River Song appears in. Formula is this, 1) the Doctor runs off to do something dangerous. 2) After he's gone for a while, River mentions that if anything happens to him, she'll kill him. [beat] "He's right behind me isn't he?" 3) Cut to Doctor doing/saying something clever right behind her.
Power Rangers: "Say my name and I appear. Why have you summoned Quagmire here?"
In an early episode of Supernatural, the boys fight Bloody Mary. Needless to say, this trope comes into effect. The boys finish her off by getting her to look into a mirror and letting her own reflection turn her powers on her and destroy her.
Alton: All right, which one of you at home said "Nutritional Anthropologist"?
Deb Duchon, Nutritional Anthropologist: That guy, there... naugahyde chair, green pants.
Alton: Yeah, well, (through megaphone) thanks a lot, Mr. Talks-to-his-television!
Neil on The Young Ones once summoned the demon Futumsch to Neil's shared flat by saying his name, which was due to him wondering what Mike was talking about. Not that any of the guys ever noticed Futumsch was there, mind. (Futumsch complains about his name being an obstacle to being summoned.)
In Brazilian sitcom Toma Lá, Dá Cá, whenever the apartment manager's name is mentioned, she knocks at the door and comes in. At a certain point of the show, the Genre Savvy characters would try to stop whenever someone started saying her name.
In Scrubs mentioning "Johnny the tackling Alzheimer's patient" will result in JD being tackled by Johnny at least once that episode.
Johnny: Who am I?! <Tackle>
The Tales From The Darkside episode "Seasons of Belief" has a couple on Christmas Eve telling their kids the story of a monster who's so full of himself, if he hears anyone say his name, his ears will transform into wings and he'll hunt them down and squeeze the life from them, (often while singing a song about himself). Supposedly, the only way to get rid of him is to finish telling the story about him. The parents stop to assure their kids that it's just a story and that there's nothing to be afraid of. The monster takes this moment to reach inside the house and crush the skulls of the parents, (though curiously leaves the children alone, despite them all having said his name). In the short story the episode was based on, the monster was implied to have killed everyone.
WWF/E wrestler The Undertaker does a very Candle Jack-ish variation of this. Basically, if his name is brought up in an offensive way while he's around (or even if he isn't), a gong will sound, and the lights will go off. Then he will appear behind the offender and usually chokeslam or Tombstone Piledrive them to the mat.
In Raising Hope, the Dog-Head Man knows when people are talking about him. At least, according to Jimmy.
In Nikita, Birkhoff gets an alert whenever anybody online runs a search on his name.
In The Muppets Valentine's Special andThe Muppet Show, mentioning any term for exploding or bomb and Crazy Harry will appear, detonation plunger in hand and BOOM! Kermit once had the misfortune of causing this three times in a row on the Ben Vereen episode.
In the Series/Warehouse13 episode "13.1", Claudia and Fargo hide from attacking robots in an artifact crate, and the artifact starts to activate. Fargo starts to ask if the artifact is what he thinks it is. Claudia stops him, as things will get ugly if he says its name.
Mentioned once on House of Anubis.
Jerome: I mean it, I am going no where near Rufus ever again. (Phone goes off) Oh, speak of the devil. Literally, I'm surprised my phone didn't burst into flames...
Alfie: What's he say?
Jerome: ...It's not repeatable.
In the song "Black Fox" whose artist varies, some bored foxhunters mention that if the devil himself showed up, they'd "run him such a race." Out of nowhere appears a black fox with red eyes, which the exited hunters chase all over the countryside. Eventually, the fox swims a river, and upon reaching the other side, reveals itself to be Satan, who more or less exclaims "Surprise, *** !" The terrified hunters flee back to town.
For some odd reason, in Lupe Fiasco's "The Cool", whenever The Game is mentioned, someone dies (unintentional. Maybe.). You don't even hear him say it in his own song due to this reason:
If you die, tell 'em that you played my game
I hope your bullet holes become mouths that say my name,
Depending on how strict their adherence to the 3rd Commandment is, some people refrain from saying God's name as well, though that's less out of fear of summoning Him (seeing as He's already, you know, omnipresent) and more because to do otherwise is seen as blasphemous.
Various old folklore: Not only the Devil, as mentioned above, but Cao Cao in Chinese folklore, wolves in France, and various predators in various places.
An especially interesting case is bears. "Bear" is itself a euphemism for the creature, a word (meaning "the brown one") used instead of their name to avoid drawing their attention. The substitution happened so long ago that we have little idea what the real name was. Based on reconstructed Indo-European, the old Germanic word for bear would be "urþaz" (or something similar, from Proto-Indo-European hrtkós); given that the current word in English has cognates in the other Germanic languages (for instance, the German "Bär"), the change probably occurred at the proto-Germanic stage, and the ancestors of the original English speakers stopped using the old word.
Similarly, the Slavic term for a bear is medved, meaning "one who knows where the honey is." Which itself has been known to get substituted with euphemisms like "furry one". It's in fact a double-decker euphemism, since the Slavs also were originally using the word very similar to "bear" (that survives as a stem in the Russian word berloga "bear's lair"), making further euphemisms like "furry one" or "mishka" (Russian for "Mikey", as in, little Michael) three-storied euphemisms.
Finnish has roughly fifty different terms for a bear, the euphemisms ranging from "dew palm" to "the apple of the forest".
This actually continues to this day. In Central America, Mayans will never refer to the jaguar by its name ("balam") for fear of invoking its presence. They refer to it as "chac mool", which means "red paw"
This was so prevalent when it came to wolves in Sweden that the most common euphemism ("varg", meaning killer or strangler) became the proper name.
The fairy Puck will appear if you say his name, in folklore and in William Shakespeare's works.
Unlike in the Bard's play, encountering jolly old Robin Goodfellow in the older folklore tended to get you into far worse fates than growing some donkey ears.
One old wives' tale is that of Bloody Mary, who supposedly appears and very violently murders anyone who says her name three times while looking in a mirror. Or seven times, and maybe you have to do it by candle light, or maybe you have to taunt her that you killed her baby. Myths are like that.
Hades of Greek Mythology is a good example. The Greeks believed saying his name drew his attention, so they called him by all sorts of nicknames and titles, like "The Wealthy One" or "The Host of Many."
Call Of Cthulhu supplement Terror Australis, adventure "Old Fella That Bunyip". The investigators are forced to say the phrase "Eleanba Wunda" to drive Bunyip upstream. Unfortunately for them, it's the name of a spirit worse than Bunyip, which will appear if its name is chanted too often. The second time the investigators do so they feel a cold wind, and the third (and final) time Eleanba Wunda almost appears.
Dungeons & Dragons: In early editions, saying the name of a demon could cause it to turn its attention to the speaker and attack him if possible, and speaking the name of a devil (which was inscribed on its talisman) would call forth that devil.
In Forgotten Realms saying the name of a Chosen of Mystra (such as Seven Sisters) outside of dead magic areas alerts them and allows to hear the next nine words uttered by the speaker. This was used a few times both for startling folk by quoting their previous statements and more important things — e.g. in Elminster's Daughter some Red Wizards with a hostage made Elminster swear he will not act against them, and then he began to mumble something repetitive. If you know who The Simbul is, the rest of this scene is as obvious as it is messy.
3.5 has Truenaming, which around level 18 gives a feat that allows a character to do this with a use-name of their choice. Speaking the use-name, afterward, allows the character to know where you are, what the general situation is, and lets them decide whether or not to be teleported into the area. Depending on the character in question, this can either be an example of this trope, or Call On Me. Or, in some cases, both at once.
Also from Dungeons & Dragons: any good or neutral creature that speaks Pazuzu's name three times will catch his attention. He sometimes offers to aid such a creature if they're in trouble... but accepting a boon from a demon lord is guaranteed to pull you into evil.
Also in the 3.X Deities and Demigods Handbook it states that Deities are generally aware if anyone says their name, anywhere or any of their common titles. This generally won't summon the deity to you of course, but that does make it hard to mount an assault on the gods...
Which is why a few of Forgotten Realms novels got "Psst! No names!" scenes from avatars and other canny characters.
One DnD sourcebook (likely The Book of Vile Darkness) relates the story of a particularly huge prick of a merchant who would take advantage of this rule by selling a parrot to rich-looking individuals. When they got out of town and onto a deserted stretch of road, their new pet would fly away and start shrieking the name of Orcus—a freaking demon lord—who would appear and murder the poor saps. After Orcus had teleported back to the Abyss, the merchant would then gather up his dead victims' gear. That he would pull this trick repeatedly says something horrible about the merchant and a little pathetic about Orcus, who apparently has a lot of free time on his hands.
More importantly, how did that merchant manage to teach the parrot to say "Orcus" without being killed?
Another example of this which was legitamite is the Demon Lord Fraz Urb Lu, who is notorious for using a unique talant to use the names of other Demon Lords to trick them into thinking they have been summoned. His usual strategy is to do this, and then teleport away right before the victim appears, assuring that the angry demon will take out his anger on whoever Fraz Urb Lu had been fighting. (This strategy naturally has made Fraz Urb Lu universally hated among other Demon Lords.)
Although its been referenced in several other tropes, the legend of the Serpent's Coil still (sort of) counts. A 2nd edition myth that made it into 3.0 before being retconned out at the end of 3.5, the myth went that Asmodeus, the king of Hell, was actually a very advanced illusion or perhaps an avatar of some sort; his true shape was a miles-long monstrosity of utter, incomprehensible evil. When he was hurled from the celestial planes into Hell, this form crashed through the dimension's reality - creating the nine levels of Hell - and came to rest in a deep, spiraling crater at the very bottom of The Pit. In an aversion of this trope however, telling someone this story didn't summon Asmodeus: it simply caused the storyteller to die within 24 hours (by unspecified means). Which is about on par for drawing the attention of overwhelmingly powerful evil uberdeities.
Points Of Light has an interesting reversal. The god that Asmodeus rebelled against in this setting is known only as "He Who Was". This is because Asmodeus literally erased all record and memory of the deity's name from history, fearing that if it was spoken just once, the slain god would regain his powers.
Kibo, mentioned below in the Real Life section, was used by Mage The Ascension. In the digital web, he set up magic tracers so whenever anyone said his name, he would instantly be able to appear, as a real person, in front of them.
The Antediluvians in Vampire The Masquerade are like this, or at least their vampiric descendants are afraid that they might be. At various points, it comes up that the names we have for them aren't their real names, just pseudonyms that are used to refer to them without the possibility of drawing their attention via Speak of the Devil.
It also shows up in Demon: The Fallen. Using a demon's Celestial Name automatically opens a remote channel of communication with them; use it unaware of that connection, and they'll be listening to everything you say...
In the Devil May Cry series, the ruler of the underworld and Big Bad of the first game is named "Mundus". Oddly, he is almost never referred to by name in other products, either being referred to as "the Devil King" or "the Devil Emperor".
Parodied (and used) in Kingdom of Loathing: if you select 'Say "Guy Made Of Bees"' five times as a choice when you encounter a bathroom mirror, you will encounter the Guy Made Of Bees. And unless you have a certain in-game item and use it in the first round of combat, the Guy Made Of Bees will hit you with as much force as the Incredible Hulk's weight in bees.
In Ultima V, the Shadowlords could be summoned to your location by yelling their name (Eg, Yell Astaroth).
Gaia Online NPCs sometimes comment their own fanthreads during events. One wonders what they make of all the dirty-minded fans.
A possible inversion of this trope (overlapping in aspects with I Know Your True Name) occurs in Breath of Fire IV. Along with straight treatment of I Know Your True Name, General Yohm hunts down Fou-lu—even at one point explicitly commenting that the mere act of uttering Fou-lu's name is sufficient to send ripples in the world that can lead someone sensitive to those ripples to find him. (Yes, this is justified—Fou-lu is not only a God Emperor but a rare case of a Physical God that was explicitly summoned to be the King in the Mountain of a dying empire.)
A straighter version ALSO exists. In a part of the game, Fou-lu refrains from revealing his name to Mami explicitly to keep this from happening, and merely goes by his nickname "Ryong"—this eventually gets blown to hell when he tells her his story via a historical legend (and HAS to use his real name in it).
In Runescape, saying Zaros's name (how fun, the fact he exists is a spoiler) gives him power. He's weakened that much - in fact, most NPCs (and other Gods) refer to him as "The Nameless God".
In Red Dead Redemption people who usually play free roam with their friends, have probably encountered a cougar. Because of that it's common to hear someone mention a cougar (example: 'Did I just hear a cougar?') and see or hear their demise. It gets better when you are in areas of the map where cougars never should/usually spawn, and you hear someone mentioning it. Hilarity Ensues.
In Dead Space 2, Ellie mentions near the end of Chapter 10 that you luckily won't have to go through the Medical Bay, where the Necromorphs are coming from. Immediately after she says this, the computer voice indicates there is an obstruction ahead, and shuts down at where else but the Medical Bay.
Liquid Snake from Metal Gear Solid is a variation: His real name isn't stated not due to fear of him being summoned, but rather because the SAS and the US Government had highly classified his real name to the extent that not even someone within the highest rank of the command pyramid is allowed to know it, as mentioned by Roy Campbell.
In the Discworld adventure game, saying the word "monkey" will cause the Librarian to appear and punch you, because he is an ape and does not like the M-word. This is occasionally mentioned in the books, but the game turns it into a Running Gag instead.
In Xenoblade Chronicles, after Shulk, Reyn, and Sharla make it out of the Ether Mine, Shulk remarks that they still haven't found the faced mechon who attacked Colony 9 and killed Fiora earlier. Cue Metal Face floating up behind them and surprising them with a taunt.
Metal Face: Hope I'm not interrupting!
In The Elder Scrolls V Skyrim, it's revealed that providing one knows the true name of a Dragon,if you invoke it via the Thu'um it will hear you and may cause the Dragon to immediately fly to your location out of curiosity as it can be considered a challenge. It is not however guaranteed, as invoking the dragon's name gives you no power over it. The Greybeards summon the Dragonborn to High Hrothgar for training in a similar manner, calling forth the Dovahkiin so loudly the whole of Skyrim trembles.
This creature (well, the creature this demon is shapeshifted into) in UC: Deviating from Normality.
Thisxkcd strip features an abuse of Bloody Mary. Explaining it would ruin the joke.
Don't say Ironman in Austin, TX as shown why in roosterteeth's webcomics, Michael "Burnie" Burns will be groundpounded.
In Goblins, the "Guide within the Well of Darkness" appears whenever someone says his name and answers a yes/no question. The catch? At the fourth summoning, he kills everyone. Incidentally, his name is Noe. Pronounced as "no".
K'seliss invokes this trope and rips Noe's throat out right as he appears. It's just as cool as it sounds.
In Chasing the Sunset, speaking the name of the evil wizard Malvenicus causes lightning and a crack of [Kra-ka-tow!] thunder. Just like that. Malvenicus [kra-ka-tow!], as it turns out, is not all that evil; he just put an enchantment on his own name back when he was younger because he thought it would be funny.
In User Friendly, Sid deals with an annoying intern by tricking him into saying "Hastur" three times.
And Stef manages to avoid being shredded by an angry Indian god by calling upon Hastur, and letting the two duke it out.
ThisGirl Genius comic averts it. Not subverts, but averts. This is a trope-heavy world with Genre Savvy people (as a survival trait), and the named individual is a genuine Hero.
Schlock Mercenary had this hapening with Para Ventura — she walked in after mentions she fitstwice in the first 9 pages from her introduction. Just so readers didn't think that her legendary status among the robots is overblown or that nothing wacky will happen around her.
The Binder of Shame; El Disgusto's character is caught stealing from the other characters and killed. His last words are "You'll pay for this! You'll all pay for this! Hastur! Hastur! Hastur! Hastur! Hastur!" Fortunately (or unfortunately as it turns out), the wizard NPC resurrects the group.
The Makeover Fairy from The Nostalgia Chick can do this, appearing in a puff of sparkleswhenever somebody says her name. Either it's a new ability or the others didn't know about it yet, since at one point Chick comments that she wasn't sure if it would work.
In a South Park episode, saying Biggie Smalls' name three times while looking into a mirror will summon his ghost, which really pisses him off when he's got things to do.
Kibo originally became known on Usenet for searching for any occurrences of his name (whether they refer to him or not) and responding to them. Naturally, this became rather less possible once he became something of a Usenet celebrity.
You are allowed.
There was a forum in Brazil, dedicated to Games Online ( Fórum JOL - Jogos On Line ), and is really really big (hundreds of sub-forums). In this forum, one of members known as Ninja Luke (later, Ninja Luke bot) EVER APPEAR in a thread replying the posts anytime someone refer to him or any ocurrence of his name.
Google has a tool that lets you track the entire Web for instances of a certain phrase, such as your name. Knowing this does not make it any less creepy when one of its users suddenly materializes in your forum discussion of them.
Twitter codifies this, providing you a whole new tab for when your @username appears in someone else's tweet.
The Chinese general Cao Cao (3rd century AD) was so well known for his rapid marches, the Chinese term for this trope since the time was "Speak of Cao Cao, and Cao Cao will appear." (And this was way before he could Google it. Impressive.)
A once-popular internet meme says this of Candle Jack, who kidnaps whoever spea
icycalm of Insomnia.ac keeps track on reactions of his articles in a forum topic made for this purpose, and sometimes rants about who he feels has misintrepretted whatever he said. Some people say that he may also show up whenever he's mentioned and end up in a flamewar about it, but he doesn't seem to bother doing that much these days.
This may be even subverted as he has recently made a thread about his potential impostors.
As stated on this page, people of old didn't dare saying "bear", fearing that it would summon one.
Actually, bear meaning 'the brown one' was the equivalent of 'He Who Must Not Be Named', the name that people used so as not to attracted the animal by using their real name. We don't know what the original name was as it has been replaced by the euphemism.
The old Swedish had a similar fear about wolves. It became so prevalent and went on for so long that the most popular nickname stopped being a nickname and became the proper name, though thankfully the fear fell into obscurity before it happened again.
Mafioso Vincent "The Chin" Gigante was so feared in the mafia underworld that people would tap their chins rather than say his name out loud.
More likely, that was done to bypass FBI wiretaps and whatnot.
A certain fundamentalist with a "4 step proof of God" is known to regularly google his name and spam any forum on which it is posted with said "proof".
In the AI field, there's a crank who goes by Mantifax (replace the As with Es) whose obsessive self-promotion efforts include appearing on any site that mentions him.
Demonologists usually advise people to not speak about the demon while in a demonically infested house. Some activities, like listening to recordings of exorcisms for instructional purposes, are also considered "opening doorways" that could attract the wrong kind of attention.
Tagging somebody's name in a Facebook post alerts that person to the post. It's not uncommon for people to post the name on its own to get their attention.
The card of Death (but not, surprisingly, The Devil) in Tarots is also known as "The Nameless Arcane", since many feared that saying its name would summon it.
There is a certain transphobic Lawyer from the state of Maryland who is known for ego-searching her own name and attacking/outing anyone who criticizes her. For this reason, it is not uncommon on transsexual blogs to see her name censored.
You know, there's also that one religious movement that's really touchy about its public image and sics lawyers on anyone who says even remotely unflattering things about them.