here:
http://www.namenerds.com/uucn/celebname/celebmomHIJ.html
It says his full name is
Jack John Christopher. I also remember hearing it like that when he was born and I thought "Why didn't they just name him
John, nn
Jack ?"
Johnny Depp's name is
John Christopher, though. So I don't know if he wanted him to have a different first name on his birth certificate so he chose
Jack John Christopher or if he is really just
John Christopher. I would like to know for sure....