Last week I asked if you knew what Billy the Kid’s birth name was. You can find that post here: https://whenibecameanauthor.wordpress.com/2013/05/23/billy-the-kid/
Billy the Kid’s real name was William McCarty. William Henry McCarty to be exact. McCarty is the maiden name of his Irish mother, as no one knows his father’s true identity.
William H. Bonney was a named used at the height of Billy’s notoriety as an outlaw, and Henry Antrim was another one of Billy’s many aliases.