If we ever had a third boy, we'd be seriously stuck for names. I have always loved Sebastian but nixed it based on popularity. Around here it's as common as Andrew or Michael was in the 70s and 80s! My husband thinks it's too posh though, which saddens me.
So how many have you come across? I think there are three at my sons' daycare of about 60 kids. I don't care if it's mildly popular but not on the level that Jack is, for example.