You might go back to the home page on this site and click on "Status of the Database" under the heading "About This Site" on the left-hand side. When you get to the Database page, scroll down to "Length" for some statistics on the 10,000 first names in here.
Can't help with surnames, altho,
www.genforum.com lists 1,000s and you might work up your own counts from that.
- Da.