I was officially divorced in 1999, state of divorce N.H. Our decree stated we share legal custody. My ex deserted his daughter 6 years ago, we have not heard from him since. My daughter (now 13yrs old) wants desperately to get rid of his name, she wants to change her last name to match mine (which is my maiden name). We have been told that because my ex and I share legal custody, we need his permission. I have no idea where he is or how to find him. Is there a way to get legal custody changed to just me or have all his rights taken away. I just want my daughter to be happy and I know this will help.