From Tales Of Symphonia, the last in a venerable line of demon hunters. He asks the party to schlep around the world collecting "Devil's Arms", for what turn out to be less-than-savorypurposes. Still, with a name like that, you'd think the party would have guessed something was up.
Amon is the name for the Sinistral of Chaos in the first two Lufia games.
In Shadow Hearts and its sequel, Amon is one part of a demonic trinity. It is first used by Albert Simon to combat Yuri. It later becomes the method Yuri uses to challenge the second games Big Bads who had made pacts with the other two points on the trinity, Asmodeus and Astaroth.
Ronan 'Beelzbub', the "hero" of Naruto Veangance Revelaitons. However, it's unlikely the author actually knew the origin of the name and simply used it because it sounded cool. Although, it is a fitting name, considering how demonic and evil the character is .
BelialVamdemon, Big Bad of Digimon Adventure 02. Digimon loves this, apparently. Was dubbed as MaloMyotismon, which still evokes the adjective variety, but fell flat. Then again, so did BelialVamdemon.
Then again, according to some mythos, Belial was the very demon who tempted Lucifer.
Angel Sanctuary: The Mad Hatter, one of the Seven Satans of Hell, whose sin is Pride, was given the name Belial by God. Not only does Kaori Yuki mention that the name means useless, but Belial is also mentioned as being in love with Lucifer.
In Sanctuary, this is the name of the Lord of Lies. In Diablo III, he's behind the trouble in Caldeum and you're charged with taking him out.
Also Star Ocean: Till the End of Time, in which he is fought alongside one named Belzeber (Baalzebul or Beelzebub) and subsequent to one named Azazer (Azazel). Oh, and the guy they work for is called Lucifer, though the American port, at least, changed it to Luther.
Belial's used to such an extreme in Devil Survivor that not only do they have a boss named "Belial", but if a demon so much as has "Bel" in its name, you know it's going to be a tough fight. It even reaches the point where they renamed Baldr to Beldr so that he could fit the rule.
The bio stage boss in Gradius IV is supposed to be named this, although it's transliterated as "Viral" in the US manual.
A Recurring Boss in Odin Sphere. Played straight in that while he is a dragon trusting of humanity, he was magically enthralled to the Wise Men as a result and winds up fighting every protagonist, with Cornelius as his final opponent.
Oracle Of Tao, the first Big Bad is Belial. The second is a fictitious angel named Estheriel.
As a side note, one of the heroes is named Azrael, below.
Demonica from the PS2 medieval take on Powerstone, Barbarian. Though her story is different, you can definitely see the resemblance in body stance, personality, and the reasons for despising humans.
The Demon Core, a fourteen pound ball of Plutonium that was used in various experiments during the 1940s. Lab accidents lead to two researchers dying of acute radiation poisoning.
In Higurashi No Naku Koro Ni the Sonozaki sisters and their grandmother all have the character for 'oni' (demon) in their names. (The twins' mother did, too, but had to change the spelling when she got married.) It's an old family tradition...
For Katekyo Hitman Reborn!, the assassins of the Varia squad have names like Leviathan, Belphegor, and Mammon.
Lala Satalin (for "Satan") Deviluke and Nana Asta (for "Astaroth") Deviluke from To Love-Ru.
Heavily subverted in Timothy Zahn's Heir to the Empire trilogy, as, when Han and Lando first meet Garm Bel Iblis, they disagree on whether he can be trusted, with Han sure he's on the up-and-up, while Lando is more suspicious. Readers familiar with this trope might tend to side with Lando, since Garm was the name, in Norse myth, of the Hound that guarded the gate to the underworld, while Bel, an alternate spelling of ba'al, in Christian demonology, was/is the name of a demon, while, Iblis is, in Arabic, an alternate name for Satan. It turns out, however, that Han is right and Garm Bel Iblis is a straightforward white-hat.
The true name of the Dark One in The Wheel of Time is Shai'tan, an anglicized form of the Arabic word for Satan.
Umineko No Naku Koro Ni has the Quirky Miniboss Squad, the Seven Sisters of Purgatory: Lucifer, Satan, Asmodeus, Beelzebub, Leviathan, Belphegor, and Mammon. Their main job in the series is carrying out human sacrifices to resurrect their mistress. (And Fanservice.)
The demons from Ars Goetia - Ronove, Gaap, Zepar, and Furfur - also follow this trope pretty well, to the same extent as the Stakes of Purgatory.
Doctor Hell from Mazinger Z. The dubbed version (Tranzor Z) was worried people might be offended by that, so they called him "Doctor Demon" instead. Yeah, that's a LOT better.
InuYasha has Naraku, a pun on the word "Naraka", the term for Hell in Buddhism.
The Trope Namer and Ur Example would have to be Hel, the Norse death goddess. Her realm is also called Hel, and this name was later absorbed into the English language to refer to the Christian underworld.
Front Mission: Gun Hazard has Colonel Ark Hellbrand, whose military takeover of the Republic of Bergen kicks off the plot. Really, though, putting a guy with a last name like "Hellbrand" in charge of anything but maybe a fundraising dinner is genre blind bordering on suicidal.
If you go for a variant on "beelzebub" or "satan", you'll generally look like you're trying too hard, though. Unless you're in Japan: Mr. Satan (from Dragon Ball Z). He's not evil, though, and while he'd be a Badass in any other Verse, in DBZ he's a Muggle with delusions of grandeur. Digimon also gives us Demon, Beelzebumon, and SkullSatamon. They were dubbed as Daemon, Beelzemon, and... SkullSatamon?!
An NPC in Demon's Souls that only appears after you acquire Pure Black Character Tendency, which is achieved by either killing off friendly NPC's or invading other players' worlds and killing them and after you kill Yurt the Silent Chieftain, her accomplice (who will also assassinate NPC's in the Nexus if left alive long enough). When you speak to her, she will send you on missions to assassinate friendly NPC's, offering valuable items in return. When all the missions are completed (when everyone in the Nexus and beyond are basically dead), she will attack and attempt to kill you. All of this is accompanied by her evil appearance and malicious voice.
Dahlia informs the protagonist that the strange marks around Silent Hill are the mark of Samael, who will enter the world to destroy it if Harry does not take the talisman she gives him to the right place in time. She's lying. Her cult is trying to summon their "god," and the talisman allows her to break into Alessa's otherworld.
The mind-rending, city-destroying, giant alien monsters of Neon Genesis Evangelion are called Angels. While some have almost beautiful shapes, most are bestial monsters or, seemingly, physically impossible (such as a 600-metre by 3 nanometre floating circle and a floating, proton beam-firing octahedron) Furthermore, the most beautiful Angel, Arael, a giant, glowing, winged creature in space, is the cause of the trope-naming Mind Rape, and is a prime example of Light is Not Good.
The serial killer in the Criminal Minds two-parter "The Big Game"/"Revelations" has an alternate personality who believes himself to be the actual, biblical one.
On Supernatural he is the voice of religious fundamentalism and zealotry in heaven. Oh that, and he wants to restart the apocalypse which the Winchester boys had previously averted.
Averted with Raziel from Christopher Moore'sverse. While he can come off as quite terrifying, he's actually the origin of Dumb Blonde jokes, and with good reason. Sent to Earth to grant the Christmas wish of a distraught child, he intends to bring back a Mall Santa the kid saw inadvertently killed, but winds up resurrecting an entire graveyard worth of brain-hungry zombies. In Lamb, tops himself over and over, leading to pinnacle example of Raziel-ness:
"The angel confided in me that he is going to ask the Lord if he can become Spider-Man"
Raziel is one of the Celestial Hebdomad from the Book of Exalted Deeds from 'Dungeons & Dragons third edition. He's the most warlike of the archangels, and is a slayer of fiends.
Uriel makes several appearances in The Dresden Files, helping out the protagonist, Harry Dresden, who nicknames him Mr Sunshine. Heavily implied to be the most dangerous archangel, and outright stated to be 'Heaven's spook' and he who killed the firstborn of Egypt. He also gives Harry a very nasty fright when he objects to being called 'Uri'. Justified in that Harry's nicknames in particular have power, and that part of his name is very important.
The name of a planet visited in A Wrinkle in Time, Particularly the one where the children ride on the back of Mrs. Whatsit, who has transformed into a sort of winged centaur.
In Dean Koontz's novel Hideaway, The Angel who it is strongly implied Was the source of Hatch Harrison's visions, and who speaks and acts through him as he kills Vassago, who we know had renamed himself after a Demon.
Fanfiction
In Manchester Lost and Fanfic/Paradise Thwarted, he is one of the 4 archangels, and as in the above, possibly the strongest. However, he is also a complete Cloud Cuckoolander and intersperses moments of pure Badass (he nearly rips Lucifer in half! And throws him all over the place) with hilarious moments e.g. hugging people, becoming a fluffy bunny magnet for 3 weeks and being utterly oblivious to Belial's attentions, Belial being Archdevil of Lust.
Live Action Television
Uriel from Supernatural appears at first as just another dickish angel (Of which there are many) who just doesn't like the Winchesters. And then he tries to kickstart Armageddon.
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Film
