I like
Caroline, it's a nice classic name that goes well with many middle names. I'm not a fan of Coraline, I think it would be confused with
Caroline a lot.
Cora is nice, if a bit dated though.
Personally, I'd prefer my kids not to have the same initials, but I don't mind it in sibsets.
I like the nns
Callie (
Caroline) and
Cora (Coraline).