Census & Genealogy.

Ok, the census site does have a genealogy section.

They have a name distribution file which gives the frequency of surnames and names in the 1990 census.

The Roche entry reads -

ROCHE 0.006 52.290 2053

So, 0.006% of the population sample had the surname Roche, and it ranks 2053 in popularity!

From the male first name distribution -

CONRAD 0.022 83.595 456

So, the name Conrad ranks 456 in popularity and 0.022% of them had this name!

The female first name distribution is also available.