Board Thread:Questions and Answers/@comment-94.12.47.56-20150218024543/@comment-26087493-20151028051222

Most of these are considered to be misnomers, aliases or lies created by the Joker. Jerome isn't the Joker, as indicated in newer episodes of Gotham & "Jack Napier" is just a pun on the term, "Jackanapes," which an old-timey term for a disrespectul person or a monkey (Like calling someone a "varlet" or "scalliwag." Joseph Kerr is very obviously also just another pun: His name is Joe Kerr...He also stole the identity of eccentric crime novelist Oberon Sexton & "John Dough," the "Most Normal Man in America" when he tricked Snapper Carr into outing the Justice League's Secret Sanctuary. In the controversial Batman Confidential, he is supposedly an inventive criminal named Jack and most recently, in Detective Comics# 27, Vol. 2, Batman's first villain in this retelling, Alby Stryker, is implied to be the Joker, although an imposter who killed Red Hood One & took his place also fell into a huge vat of acid. The Joker himself states that he prefers his origins to be "multiple-choice" and due to his insanity and his fingerprints melting into "globs of acid", his name is most likely semi-impossible to find.