I don't think he loves you or the child enough. The blatant disregard for your feelings is bad enough but if he would not acknowledge his own flesh and blood simply because he wasn't named a certain way, then I doubt the extent of his fatherly love. You probably deserve better than him.

Anyhow. Your relationship with the man might become irreversibly damaged no matter the name given. If he gets his way, it will be certain to bug you for many years to come. If you get your way and he miraculously stays, he'll be bugged in a similar manner, and the two of you would have the same argument about naming if another child happens to enter your lives. Both scenarios will strain your marriage and relationship.

I'm but an outsider so I don't have it in me to tell you the best decision but you may have to consider leaving him, especially if he chooses not to give in.