My boyfriend believed he was going to have a child with a woman he was not married to. He wanted the child to have his last name and he does. When the child was 6 months old we took a dna test and the child is not his. She has known for a year that the child is not his and the bio father is in the babys life but still has my boyfriends last name for the baby. Is there anything we can do so she can change it?