Baby names

My SO and I can't agree on a boy name. He's always wanted his son to be a "junior" and naming him James, I would be fine with. But he said he would call him JJ. And I don't like it at allllll. He insists on that being the name and I feel bad for saying no to his dream but it's just not a name I could see my son having. Have any of you ladies gone through this, where your SO has his mind made up and won't budge? What do/did you do?