I don't really like either, sorry.
Zinovia is a bit too frilly and complicated for me. I prefer
Zinnia, which is a bit more simple. Also
Zinovia sounds a little bit like a brand name to me for some reason, perhaps because I've seen brands like Synovia and Zenobi which sound similar.
Cyrilla just makes me think of the cyrillic alphabet, so it doesnt really sound like a name. I don't like
Cyril on a boy at all, and
Cyrilla is really similar.