I like Nora, Kira (love this), Cordelia, and Hannah.
Kayla is super trendy, Kendra makes me think of the playboy bunny, and Darby I just don't like. I prefer Darcy.
Seems like you like Cs and Ks, maybe Cora, Coralie, Cleo, or maybe he'd go for Kyra or Keira over Kira since they are closer to Kayla/Kendra?
You may want to look into the list on this site that called Names Dads Prefer More Than Moms. Some pay pique his interest and determine what his naming style is.
I'm not a big fan of Kendra or Kayla either. Are the rest of the names more your style, or are those your compromise names? Have you considered Kaya? I like it a lot more than Kayla, but it's along the same lines.
From your list, my favourites are Nora, Kira, and Hannah, although Hannah is pretty popular lately.
It seems like your husband (and maybe you too) like names with a K- style. Here are a few that have more of a classic feel than your husband's choices, but not too frilly:
Nora-love and in my top 2. Classy and elegant and simple.
Darby-nah, there's so many other names out there that are nicer imo. Sounds like derby.
Kira-sounds dated ie from the 80s
Hannah-really like this
Cordelia-I used to work at a nursing home and there was a 90 ish year old woman with this name. I know vintage names are back in style but this is one of those to me that just screams old lady.
Kendra-80s, playboy playmate girl with her own reality show, blonde, too cutesy and trendy
Kayla-same, as above. I know so many Karas, Kinlees, Kaislee, Kates, Kylas, etc. But I do love Kassi/Cassi!