Sometimes the girls will change their name on purpose. If a Porn Chick develops a reputation as a flake, being difficult to work with, or burning directors/production companys more than once; the girls work slows down because directors don't want to chance wasting any time and money on her. So the girl will change her name to get work, and change it again once the directors catch on to her new name.

Note: This isn't limited to porn chicks either alot of your wanna be, and small time production companys also change their name once, they get known for burning people in the industrie to many times.