I'm the biggest
Victoria fan around, and I can see what you say about the similarities between
Victoria and Calpurnia. Yet I still find it impossible to really like Calpurnia. There are things I like about it, the first syllable and the ending, but the middle syllable, "purn", just kills it for me.
Callie is an adorable nickname, but I'd use
Calanthia or even Caledonia to get to
Callie before I'd use Calpurnia.
I think it's usable, though, with the nickname
Callie.