I feel like I hear
Connor a lot, but that might be because there's a little one who lives a few houses down and is always outside. I don't think it's too popular. I do generally think of it as more of a 90s name, probably because that's when it had its dramatic leap in popularity, but, objectively, its popularity has been pretty consistant for a long time now.
I prefer the
Conor spelling, which looks more streamlined and less like a surname to me.