My husband wants to change his surname

I know that my concern is kinda weird. My husband doesn't like his surname because it doesn't sound nice. Eversince we had a relationship he always open up the topic of using his middle name as his surname. We always argue about this. Now that we are married, I am pregnant and about to give birth few weeks from now, he again insisted that we will put his middle name or my middle name as our daughter's surname on our child's birth certificate. And he again insisted that we will change our surname and i always disagree with his idea. How can I convince him that it is a bad idea? And if ever, is it possible to change your surname to your mother's maiden name even if you are not an illegitimate child? Thank you in advance.

You could only do that through a court order.