The parents of a child are unmarried and the father's name is not on the birth certificate. The mother gave the child her last name. Does she have to change it to her father's last name?
NO. In most states the father of the child must be present at the time of birth to sign the birth certificate as the father of the child. It could, in reality, be any man who …would be willing to take legal responsibility for the unborn child. A child will only automatically get the father's name if the two parents are married. Even if the father pays child support, the mother is not obigated to change the child's last name to that of the father. (MORE)