I did think about
Caitriona, but there's the spelling issue. I have these characters practically talking to me in my head, with very firm opinions, and the dad insists that it must be a name that's easy to spell and pronounce. (
He makes fun of Irish spellings.) And it's probably too painfully similar in sound to the recently deceased
Kate. They wanted to honor her, but also give the baby a name that's her own.
I guess I'll think about it some more. ;)