Boyfriend has me second guessing name

Alyssa
We agreed on names almost as soon as we found out we were pregnant. Found out we're having a boy, so Cooper Nathaniel it is. It fits my current theme with me other two kids. Tonight he comments that he's all for changing the name because his ex's last name is Coop. I absolutely love Cooper, but now I'm second guessing it. Would you leave it, or pick a new name?