* There are two popular comic strip characters known as ''Dennis the Menace'': [[ComicStrip/DennisTheMenaceUS the American one]] created by Hank Ketcham, and [[ComicStrip/DennisTheMenaceUK the UK one]] featured in the anthology comic ''TheBeano''. Both are young grade-school boys who own dogs and get into mischief, but they're otherwise quite different. To make the coincidence even more astounding, the characters first appeared (in different publications, on opposite sides of the Atlantic) ''within three days of each other'' in March 1951.
** To avoid confusion the American verison is "Dennis" in the UK and the British comic is called "Dennis and Gnasher" outside the UK.
* DC and Marvel each have a character named Atom Smasher (typically differentiated by the Marvel one being Atom-Smasher). In DC, he's the size-changing grandson of the energy-projecting villain Cyclotron. In Marvel, he's the energy-projecting enemy of the size-changing hero Black Goliath.
* The two Captain Marvel's.
** Only two? [[Comicbook/{{Shazam}} Billy Batson]], the Lieutenant Marvels (all three of whom happened to share the name "Billy Batson" with the original) Mary Batson, Freddy Freeman [[Comicbook/{{Shazam}} on one side]], and Mar-Vell, Genis-Vell, Phyla-Vell, Monica Rambeau, Khn'nr, and more [[Comicbook/CaptainMarVell on the other]]... Granted, most of them have alternate names.
** To add to the confusion, Monica Rambeau and Genis-Vell have both used the name Captain Marvel '''and''' Photon. They at least consciously made the swaps together so you didn't have both using the name at the same time.
** There's the alien android who said [[http://www.internationalhero.co.uk/c/capmarv1.htm SPLIT!]] Who, in what is surely a complete coincidence, had a young friend named Billy ''Baxton''.
** So Captain Marvel [[Music/TheBeatles zapped him right between the eyes]]...
** And then there's the SpacePirate [[Series/KaizokuSentaiGokaiger Captain Marvelous]]. In a twist, that's supposedly his ''real'' name, his superhero title is [[ColorCodedForYourConvenience GokaiRed]].
*** [[OverlyLongGag Aaannd]] we have the name Marvel Boy which has been used by a member of the NewWarriors (who had an AlternateTimeline double to make things weirder), a teen Marvel superhero from the 50's, and a current Kree hero who is part of the YoungAvengers. Marvel Boys have nothing to do with Captain Marvels, though. Neither does [[ComicBook/{{X-Men}} Jean Grey]] who once went by the name Marvel Girl.
**** That said, the 1950's Marvel Boy had powerful Quantum Bands which eventually went to the hero ComicBook/{{Quasar}} who also very briefly took the name Marvel Boy before settling on Quasar. The Phyla-Vell Captain Marvel adopted the name Quasar for a while.
**** Speaking of Marvel Girl, this name was also used by [[ComicBook/FantasticFour Reed and Sue Richards]]' future daughter Valeria before [[ItMakesSenseInContext she was reverted into fetus inside her mom]], and Jean's AlternateUniverse future daughter Rachel Summers.
** Now that we have the whole Captain Marvel/Photon/Marvel Boy/Quasar thing sorted out, let's turn to MsMarvel. Ms. Marvel was the DistaffCounterpart to CaptainMarVell. The name was also taken up by another woman who briefly joined the ComicBook/FantasticFour. During ComicBook/DarkReign, Moonstone, a member of the ThunderBolts, took the name Ms. Marvel as her identity in the DarkAvengers.
**** And more recently, the former Ms. Marvel has taken up the Captain Marvel mantle herself.
***** Which has in turn caused Marvel to recycle the Ms. Marvel identity for a new character named Kamala Khan. She was inspired to be a hero by the original, but other than that there's absolutely no connection between the two.
* Multi-Man of DC Comics (debuted 1960) and Multi Man of the ''Impossibles'' cartoon (debuted 1966) have surprisingly different powers.
* ThereCanBeOnlyOne ComicBook/SpiderMan. However, there has been multiple identities of his somewhat "DistaffCounterpart" ComicBook/SpiderWoman: Jessica Drew (black haired, wears red, can float, super power reels more about spider venom), Julia Carpenter (blonde, wears black, can float, super power is more similar with Spidey -- about spider web)), Mattie Franklin (seems to be [[CaptainErsatz very-directly inspired]] on Spidey himself, uses spider-legs), and Charlotte Witter (Villainess, white haired, wears green-yellow (a bit like [[ComicBook/XMen Rogue]])). And the MarvelMangaverse turns [[spoiler:Mary Jane]] into this.
* DC Comics has a Batman villain named Scarecrow and Marvel Comics has a villain named Scarecrow (who bounces around Iron Man, Spider-Man, and Ghost Rider's rogues galleries). They even teamed up in Marvel Vs. DC. There is in fact another Marvel villain known as Scarecrow, but now referred to as Straw Man.
* For whatever reason, GreenLantern Hal Jordan happens to share a name with ''his own cousin'', Harold "Hal" Jordan, alias Airwave. Yeah, what?
* American Eagle is both the superhero identity of Jason Strongbow in Marvel comics and a PublicDomainCharacter formerly of Nedor comics who has appeared since in ''ComicBook/TomStrong'' and ''ComicBook/ProjectSuperpowers''.
* Changeling is either: a minor ''Comicbook/{{X-Men}}'' adversary from the [[TheSixties 1960's]] who underwent an off-panel HeelFaceTurn and died while covering for Professor X; or another name for ''Comicbook/TeenTitans'' member Gar Logan. Both have shapeshifting abilities, but they function differently from each other (the former can change into other people, while the latter can transform into animals).
** Morph from the 90's ''WesternAnimation/{{X-Men}}'' animated series was supposed to be a modernized version of Changeling, since he technically was an X-Men member in the comics, even if it was only established through a {{retcon}}. He even had the same civilian identity of "Kevin Sidney", but the codename "Changeling" couldn't be used at the time since it now belonged to the DCComics character. Ironically, when the WesternAnimation/TeenTitans got their own animated series, Gar Logan went back to using his old Beast Boy handle.
* In the '1976, TeenTitans introduced a black female member named Bumblebee who could turn herself small, fly and sting bad guys. Years later in 1984, Marvel began publishing Transformers comics, and had been instrumental in developing the characters, hence why I can put them under comic books, and as we all know, there was an Autobot named Bumblebee who would turn into a Volkswagen.
* {{Nightwing}} used to be Robin, but ''Nite-''wing is a mentally ill man who got his name from a sign advertizing chicken wings all "nite". The latter was a supporting character in the former's series.
* Dr. Hugo Strange is both a [[TheGoldenAgeOfComicBooks Golden Age]] hero and a Franchise/{{Batman}} villain, but neither is to be confused with Marvel's Comicbook/DoctorStrange, who himself should not be confused with one-off [[TheSilverAgeOfComicBooks Silver Age]] ComicBook/IronMan villain Dr Strange. When the GA hero Strange was used in ''ComicBook/TomStrong'', his name was changed to ''Tom'' Strange, probably in part to avoid confusion and otherwise because he was in that story the alternate universe counterpart to Tom Strong.
* In the ''[[Comicbook/TheAvengers Avengers]]'' annual where future ''ComicBook/{{X-Men}}'' mainstay Rogue first appeared, a little girl, apropos of nothing, introduces herself as "Maddy Pryor," adding "I been sick, but I'm better now." A little while later, ComicBook/{{X-Men}} leader Cyclops begins dating - and soon marries - a woman named Madelyne Pryor. Readers assumed there had to be a connection between the two. Actually there wasn't. In real life, Madelyne Prior is the name of a singer with the British folk rock group Steeleye Span. Creator/ChrisClaremont - the writer of the stories in question - liked the band and used the name as an homage twice, for two otherwise unrelated characters.
** Similarly, before the Jubilee we know debuted, there was an unrelated one-shot character with the same name and power (and introduced herself with a similar line.) Evidently, it was a "wanted to reuse that character, but it wouldn't work with the way the older story ended" case.
* Fleetway Comics published stories about a kid who played practical jokes on people called...wait for it...[[SelfDemonstrating/TheJoker Joker]]. No comment...
* There's the DC / [[MilestoneComics Milestone]] hero Comicbook/{{Static}}, and a far lesser known ComicBook/{{X-Men}} character of the same name.
* When most comic fans hear the name Starfire, they think of [[GreenSkinnedSpaceBabe a hot alien babe with orange skin]], who wears a {{stripperiffic}} outfit and who is usually [[MostCommonSuperpower stacked enough]] to rival PowerGirl. The name also belonged to the Russian hero, Red Star at a time, a short-lived {{Supergirl}} villain and also a sword-wielding female warrior.
* Marvel has two separate named Golden Girl: The original Golden Age version was a BadassNormal and CaptainAmerica's love interest/occasional partner. The Bronze Age version was a Japanese-American member of Comicbook/TheInvaders who could fire {{Hand Blast}}s.
* Same goes for the Angel. The first is a BadassNormal costumed detective during the Golden Age, while the much more popular one is Warren Worthington, the WingedHumanoid member of the the X-Men.
* In the ''Knighfall'' series of ''Batman'' there is a Dr. Simpson Flanders. (No word on whether he greets himself every morning and then tells himself to shut up.)
* Two unrelated heroes also share the name TheVision. There's Aarkus, an extradimensional alien with the power to teleport, and VictorShade, a RidiculouslyHumanRobot with the power to [[IntangibleMan become intangible]].
** Though WordOfGod is that the robot Vision was created as an Expy when Roy Thomas was denied permission to use the original. The name and costume are meant to be a ShoutOut to the Golden Age version.
* DC's Liberty Belle and Blossom's alter ego of the same name in ThePowerpuffGirls episode "Super Zeroes." [[http://static.tvtropes.org/pmwiki/pub/images/Belle1942_3716.jpg One fights crime]], the other [[http://static.tvtropes.org/pmwiki/pub/images/LibertyBelleBlossom_4975.jpg gets held up in traffic while trying to fight crime]].
* There is the CultClassic ''Comicbook/{{Madman}}'' comic and a SlasherMovie from TheEighties called ''Film/MadMan''. They are both very different.
* Do not pick up the award winning graphic novel ''JimmyCorriganTheSmartestKidOnEarth'' expecting Jimmy to have any connection to [[ComicBook/GothamCentral the Gotham City Police Department]] or TheSpectre.
* There seems to be no relation between Cain Marko (aka [[ComicBook/{{X-Men}} The Juggernaut]]) and Flint Marko (aka [[SpiderMan The Sandman]]), apart from the fact that both have fought SpiderMan and were co-created by StanLee. Flint Marko's name has since been retconned.
* The [[ComicBook/BuckyOHareAndTheToadWars Bucky O'Hare]] universe is called the Aniverse, not to be confused with a much lesser-known furries-in-space comic called ''TalesFromTheAniverse''.
* The 1940s Timely Comics heroine Black Widow is definitely not the same character as the more familiar Marvel Comics Russian spy hero of the [[ComicBook/BlackWidow same name]].
* We have ''ComicBook/{{Daredevil}}'', a {{Marvel}} superhero from the sixties who is blind, but has supersenses, wears a red devil-like costume, and fights with a billy club . We also have Daredevil, a Lev Gleason BadassNormal superhero from the forties who wears a red-and-blue costume (split down the middle) and is very good with a boomerang.
* In MarvelComics, Hamilton Slade is the real identity of the third Phantom Rider, a modern day descendant of Carter Slade. Hamilton Slade is also an 18th century vampire in the Marvel miniseries ''Apocalypse vs Dracula''.
* There is a GIJoe character named Ghost Rider. When Marvel was publishing GIJoe comics, they didn't want the trademark getting confused, so his name was never use (there was a running gag that nobody could ever remember his name). Now that [=IDW=] is publishing it...the running gag is maintained, because Marvel still owns the trademark in comics.
* Marvel has two completely unrelated heroes named Prodigy. The first was a member of the ComicBook/{{Slingers}} and [[Comicbook/AvengersTheInitiative Avengers Initiative]] named Richie Gilmore, and the second is David Alleyne, a member of the YoungAvengers and former member of the [[NewMutants New X-Men]].
* This is going to be a plot point for the ''ComicBook/SonicTheHedgehog[=/=]ComicBook/MegaMan'' crossover ''Worlds Collide'' when [[VideoGame/MegaMan3 Shadow Man]] meets the Roboticized Master Shadow Man, who resembles Shadow the Hedgehog.
* Victor Zsasz is the name of a serial killer that ''Franchise/{{Batman}}'' deals with occasionally. Charles Victor Szazs is the real name of Vic Sage, TheQuestion. Not quite the same thing, but very close.