Haha, not very popular your names! I don't think that's a bad thing though, means they're unusual. I love them both, though slightly prefer Cornelius. I have a (German) friend who's Felix and think it's a lovely name but here I would probably refrain from it to spare my kid the "the cat" jokes in school. Cornelius I think is a cute name for a toddler but works for an adults as well. And as a teenager he can be Conny (I know a boy of that name, though short for something else and it works really well). Good luck with OH!