1.
Julia - nice
2.
Juliana - okay; it's
Julia with frill
3.
Juliet - okay; I like it in theory (maybe more if I was French?), but it sounds a bit contrived/romanticized to me IRL because of
Romeo and
Juliet4.
Julie - okay as a NN, sounds dated as a full name (pretty, though)
I'd assume
Giulia /
Giuliana has Italian heritage; if not, that spelling seems needlessly confusing in the US.