Legal Question in Family Law in Louisiana

Only if you lie to a court of law. Why not simply do an intrafamily adoption after you are married and then not only will the child have your husband's last name, but will be in all ways his daughter as if born of your and his marriage, including inheriting from him, and he from her? Since just to change the name on the birth certificate would require contacting the child's father, you might as well go adoption. If he has not paid in 6 years and has not been in her life, then his consent to the adoption is not necessary, and should he wish to fight it, he would have to prove he was always ready, willing and able to support and be a part of her life and you denied him his rights. Very hard to do. When it is all over, a new birth certificate will be issued showing you as the mom and your husband as the dad, and she will have your husband's last name.