Why is it so hard???

Ladiessss, my bf and I have been together going on 2 years, we are expecting our 1st child together (I have a 3yr old already from previous relationship and he is great with her) I’m BARELY pregnant, don’t even know the gender and we are ALREADY trying to pick out names.. he’s picked out a lot of “basic” names, I prefer names that no one has heard of. My previous relationship with my daughters dad lasted for almost 4yrs, from the beginning of my pregnancy he wasn’t excited, didn’t care about the name, and has since not had a single thing to do with our daughter.. My current bf is really into picking the name of our child and I have hated every name he has said and part of me thinks because I’m stuck in the feeling that this child only has 1 parent as well.. I feel bad because I reject every name and I also tell him I’ll be doing everything alone (changing, feeding, bathing, etc.) please no negative comments but advice as to how to move past these feelings? I hate being this way towards him because this is his first child but the break up with my DD’s dad really took a mental and physical toll on me (we broke up when she was 3 days old and I had VERY bad pp depression) Any advice is welcome!!!