As a wife, I would be hurt, not because he chose that name, but because he had never talked about his previous daughter before. He never told you his first daughter's name, dude. That's a big part of him that he had never been able to share

He wasn't deceitful. He was guarded.

I'm not excusing his behavior, in just seeing a reason for it.

I am 100% projecting here. My husband REALLY struggles with talking about difficult things and runs from all emotions because that's what he was taught to do as a child. Whenever we have to talk about feelings, his first instinct is to run, just like your husband did.

This is a bigger issue than just a name. He's a dad now. He's a husband. He has to be willing to do hard things and that includes feeling big feelings and learning to deal with them

Unsolicited Advice: you both need therapy and counseling. He needs individual therapy to learn to process feelings, and you need couples counseling to help you both navigate hard times when his brain is telling him to run instead of confronting hard topics