"Hitler" almost never appears per se, being an already very rare variant of "Hiedler," but variants such as that, "Hiller," and "Hibler" are. "Adolf" (and its 'slightly' less stigmatized variant, "Adolph") of course, is still seen, especially in period pieces, to evoke a kind of Retroactive Recognition.
Literature
Averted: In the children's book Heidi, written long before World War II, Heidi's kind, lonely grandfather is named Adolf.
Adolf is actually used in the novel Evil Genius. One of the villains is named Adolf Hauser. To make matters worse, he's actually nicknamed "The Fuhrer" and teaches at the Axis Institute, a school for future supervillains. May be a case of Refuge in Audacity. Oddly enough, he's not the Big Bad.
Distortions of Hitler's name, especially "Hiller", are featured in works ranging from Who's the Boss? to Isaac Asimov's The Martian Way. In these cases, these people are shown to be Hitler Expys either in-universe or by Word Of God.
The video game Vandal Hearts pulls a double whammy with the Big Bad Dolf Crowley. In fact, Vandal Hearts is full of these—it also has an antagonistic character named Hel Spites and his son, Kain.
Interestingly, Dolph is Jewish. He's even in Hebrew school.
Also, one of Mr. Burns' vicious hounds is named Hitler.
Dolf The Crow, the sort-of Big Bad from the Dutch TV-Show Alfred J. Kwak was a halfbreed of a crow and a blackbird, spoke in a German accent, turned evil, started a political party with a banner obviously similar to the Nazi flag. He also attempts world domination a few times, and all this while wearing a Napoleon-like attire.
Certainly a name to watch out for. Anyone named this will almost always be covered in muscles and/or weapons, and extremely prone to violence.
Literature
Brutus, the handsome but idiotic King of Bebba's Town from the sequels to The Sea Of Trolls.
Subverted with prison guard Brutus "Brutal" Howell in The Green Mile. A big man, but not as dangerous as his name or nickname implies. (Unless you're a recalcitrant new inmate.)
The original Brutus (Lucius Junius), who ousted Tarquin the Proud, and his descendant Brutus (Marcus Junius the Younger), who betrayed Caesar. At the time, the name only meant "stupid" (or of course by the latter's time, "icon of democracy"), without the connotations of cruelty it would take on in later centuries.
In The League of Extraordinary Gentlemen, Alan Moore gave this name to the Invisible Man, identifying him as Hawley Griffin. Not only is this a Punny Name kind of like Jackson Ripper, but it foreshadows "dangerous to women" - Crippen murdered his wife, while Griffin is a serial rapist and general Complete Monster.
Don't forget Ripper, who, even 30 years later and much more mellow, is still quite dangerous (technically, he killed Glory/Ben, which means he killed a Hellgod).
During her time on Atop the Fourth Wall, Iron Liz had a murderous doppelgänger named "Judas Liz". The name had a double meaning, as the character was both evil and wore a Judas Priest tee shirt (in contrast to the Iron Maiden tees Liz normally wears).
Lucrezia
It doesn't help that the name also means "Insanity".
Anime and Manga
Lucrezia Borgia is a character in Gregory Maguire's novel "Mirror, Mirror".
In Going Postal, Adora Belle Dearheart's stiletto shoes are in a style called "Pretty Lucrezia." It fits the trope despite not being the name of a person, because she uses them to attack a drunk (and in The Film of the Book, Moist himself, with whom her relationship is more Slap-Slap-Kiss than in the novel) and delivers a line about how she doesn't know if she can press them straight to the floor, but is willing to try.
Might not sound like a threatening name, unless you happen to have studied the French Revolution, where the original was the guy in charge of the Terror. You know, where they chopped off all those peoples heads.
Literature
David Weber has a habit of throwing him into his books, including the Honor Harrington series, and a mention in Crusader.
Others
Literature
Herod Sayle in the Alex Rider novel Stormbreaker shares his biblical namesake's desire for infanticide.
Retroactive aversion: Ralph Hinkley on The Greatest American Hero was renamed Ralph Hanley after a man with the name Hinkley attempted to assassinate President Reagan.
The future humans in The Sarah Connor Chronicles really should have known better than to give the Terminator captain of a submarine the name Queeg, even if they thought it was funny.
Jesse St. James from Glee - named after Jesse James, obviously.
Gunman With Three Names: any character referred to by three names is likely a killer or dangerous sort, based on the examples of John Wilkes Booth, Lee Harvey Oswald, James Earl Ray, and Mark David Chapman, famous assassins.
Film
One of the assorted crazy connections thrown out in the movie Conspiracy Theory is noting that successful assassins are remembered by their full names, but unsuccessful ones by just two.
One character makes an implicit accusation about a murder to another character by asking what his middle name is.
Charles Lee Ray - Charles Manson, Lee Harvey Oswald, and James Earl Ray.
For exampe, Alpha (real names: Carl William Craft) in Dollhouse. It's even lampshaded.
Not to mention the Saturday Night Live episode in which Eddie Murphy's Buckwheat is assassinated (in circumstances reminiscent of the then-recent attempt on Ronald Reagan's life), conferring instant fame upon his triple-named assassin John David Stutts (also played by Murphy).
When a real-life serial killer's identity is finally established, it's common for the news media to report the full name of the killer, including his middle name, even if the killer never used his middle name in his life. Westley Allan Dodd and John Wayne Gacy are examples. Thus, serial killers tend to be remembered as people with three names.
, a murderer famous in Britain.
Comic Books
