If you are telling us that he has not yet established himself as the child's legal father, he can initiate a paternity lawsuit, and ask that the child's name be changed when paternity is established - Kentucky does not appear to do that automatically upon establishment of paternity, and absent a provision that automatically changes the child's name, with your opposition to his request he would need to convince the court that the name change is in the child's best interest. If he has been established as the father, he can bring a name change action in court and similarly try to convince the court that the name change is in the child's best interest.

