I am trying to find out how to change your name in the state of Louisiana. My daughter's boyfriend is in the military. He is 19 and wants to change his last name to that of his step-father who has raised him. I was told that he had to file a petition in court. Does he have to appear? Does he have to file it in the state of his residence? Can he do it through the military or can he give someone power of attorney to do it for him?