My 14 year old daughter wants to have her name changed to my married name before she gets her drivers license. She has gone by my last name as a given name for school, appointments, everything since I was married 9 years ago. Her DNA donor is not on the birth certificate and has never seen her, by his own accord. I have attempted to contact him and his location is unknown. Paternity has never been established and no child support was ever sought after. How can I help her change her name without having to hire a private investigator to track him down and asking him personally?Her legal last name is my maiden name.