Via Matthew Yglesias at The Atlantic, the NYT has a report on the commonality of surnames in the US released by the Census Bureau. In addition to discussing the dramatic rise in Hispanic surnames from the 1990 census, they have a field you can use to look up your own surname. 'Eades' didn't make it into the top 5,000, but the alternate 'Eads' make 3682, up from 4803 in the 1990 census. 'Eades' turns out to be ranked #6,396 in between 'Shaner' and 'Ribeiro'.
The whole list can be found in an Excel document here (ZIP file). Incidentally, 'Featherson' is the
least common, coming in at #65,536. Sayaka's last name, 'Kosuge' (小菅), isn't even on there.