I think this is extremely geographically/neighborhood dependant!

In my toddler classes, there were tons of kids/sibs named:
Griffin
Taylor (both sexes)
Riley (both sexes)
Jordan (both sexes)
Jaden (both sexes)
Zachary
Emma
Isabel
Siobhan (believe it or not)
Grace
Ben/jamin
Tyler
Emmet
Now, I know that Dylan is very popular elsewhere, but except for my son, I don't know any and there aren't any in either school I used to teach at! I don't think that Griffin or Siobhan are very popular in other parts of the country, but I know 4 Griffins and 5 Siobhans here. I've also heard that Fiona is very popular in certain parts of the US, and as common as Jennifer is here in certain parts of the UK, but once again we don't know any locals other than our girl.
I don't think that you can avoid 'popular' names anymore, to be honest. Maybe if you were isolated to your own community. But now that we're constantly in contact with people across the country and world, I think alot of our innocence about how 'original' we are when naming our kids has been stolen.

We just picked family names or Names of Significance for our kids. I figure that if they really really hate it, they can pay the $50 when they're 18 and change it, or ask us to call them by the nickname/middle name of their choice.
I tend to feel sorry for kids who have overly unusual spellings of their names than 'popular' names. Esp. if it's an weird spelling of an extremely popular name. ;>