I've actually only known it on girls. In
Israel, I think it's fairly common (girls only, like in the bible). This is mi-KALL, right? I've seen
Michael on a girl a couple of times here too, also in spellings like Mykel and Mykal.
Micki is always cute for a girl, I think. You could probably also get away with
Millie, which I love as well.
Kassandra is not really my thing, and with
Michal, I hear too many K sounds, but that's just my personal bias.