My husband insisted that his old man name my child, but I didn't want to. If he wants to do it himself, how can I persuade him?

That depends on the name. If it sounds good, you might as well use it. If you really want to write it down by yourself, you can sit down and discuss it with them. For example, I don't think this song sounds good. Why not change it and tell them the moral? I think they will respect you if you make a reasonable statement.