Quoting Back to Noob Status:" Oh yeah. It is getting very popular. I have a second cousin named Leo, and I'm seeing it everywhere on name forums."
I *thought* about using Leo back in 2006 when I learned I was pregnant with my son. My dad was named Leonard and I wanted to name my son after him, because him and I were super close and it meant a lot to me. We went through Leo, Leon, and honestly if I had heard of Leonidas back then, I'd have brought it up. Ultimately, we just decided not to name any of the kids after anyone.