It's my seventeen-month-old grandson's name. His nickname is Leo. When I first heard the name, I admit that it struck me as very strange. But I also admit that I'd NEVER heard it before, so no wonder it struck me strange! So you see, I'm not THAT much of a name-nerd, if I'd never heard Leonidas before. Maybe I'm just prejudiced, since it IS my grandson's name, but it has really grown on me, and now I find it both beautiful and masculine (which is hard to find), not popular yet accessible. So I like it.