Corrected entry: Robert Angier's real surname is Caldlow, but he's married publicly to his wife Julia under his surname of Angier. Later on in the film after Julia's death, when Angier meets up with Cutter and Cutter explains why he can't get any work, Cutter says that nobody wants to hire the man "who killed Julia MacMillan on stage". Wouldn't she have been Julia Angier at that point?
Xofer
25th Nov 2006
Correction: Since Cutter and Angier were audience plants during those shows, it's not unlikely that Julia would've went by 'MacMillan' - either her maiden name or a stage name - to dissociate herself from her husband while performing.
Xofer