Baby name dilema....!!!!

My SO and I recently found out we are having a girl. We are both very excited about it but we got into an argument about what to name her. My SO wants to name her after his mother but I don't want to do that. 1. I've never liked the name and 2. I don't have that kind of relationship with her. I would never ask him to name her after my mom because they don't have a relationship like that. He seems to think he has final say. But it doesn't work like that. I don't know what to do to get him to see that we need to agree on her name!! Any advice ladies??