I decided to name my daughter Serenity which I think is pretty. My SO didn't like it at first but he fell in tune with it. On the other hand my MIL is trying to make me change her name. She thinks that's a boy name which is ridiculous. I want to be nice and let her know that I'm not changing her name and that's final. I feel like this is my baby and I should name her what I want. How do I let her down nicely?