The Joker's nephew from Batman: Legends of the Dark Knight issue # 50. His name is a play on the Joker's identity from the 1989 Tim Burton Batman film, Jack Napier. Although the Joker's real identity has never been revealed in the comics, writer Dennis O'Neil nevertheless payed homage to Burton's film with that issue.
Melvin Breedlove's birth name is Breedlove Melvin.
Yes
Melvin Biddle's birth name is Melvin Earl Biddle.
Melvin Olaes's birth name is Melvin Salazar Olaes.
Melvin Shine's birth name is Melvin Shine Otonna.
Melvin Turpin's birth name is Melvin Harrison Turpin.
Allan Melvin's birth name is Allan John Melvin.
Anna Melvin's birth name is Anna Elise Melvin.
Doug Melvin's birth name is Douglas Robert Melvin.
Milan Melvin's birth name is Milan Morrell Melvin.
Russell Melvin's birth name is Russell Courtney Melvin.
Melvin Millar's birth name is Melvin Eugene Millar.