I know of 5 all under the age of 2... It was on our short list until it became overly popular - it's in the top five baby names in Ohio according to the SSA.
Sounds like it's becoming more common. Isn't there a kid in One Direction named Liam and one of the Hemsworth brothers (I think the guy who played Gabe in the Hunger Games)?
p.s. I really don't follow pop culture that much. I just have a friend who is in social media and follows all that kinds of stuff.