Name disagreement

What do you do when you have your heart absolutely set on a name for your baby but your partner doesn’t like it? Currently have two girls and pregnant with third baby. Don’t know the gender yet. But we have had a definitive name for a boy since our first pregnancy so that is set in stone. But for a girl we previously agreed on a name long before getting pregnant which was not planned. But now I’ve changed my mind and fell in love with a different name that my husband doesn’t like. I don’t know what to do. Her middle name will be my moms so that hasn’t changed.