Louisiana Revised Statute 40:34 (iv) states that "If the child is born outside of marriage, the surname of the child shall be the mother's maiden name. If the father is known and if both the mother and the father agree, the surname of the child may be that of the father or a combination of the surname of the father and the maiden name of the mother." If you properly changed your name you should have a Judgment signed by the judge authorizing the name change. A driver's license is not sufficient.
Every situation is different and you should consult your own attorney to go over all the particular facts in your case. The answer given is only intended to provide general guidance regarding rights and responsibilities.