We have not had contact from her father for five years. She has asked me if she could change her last name to my last name which might I add is my maiden name I'm not married. Since she has no contact with him or his family and only knows mine she would like to share the same name. He also has never supported her financially I tried and domestic relations closed the case because they couldn't find him. Is it possible and if so how do I go about changing it?