I tried the site as well - it looks like it might be a site predominantly for those families who moved to the US - therefore the surnames are frequently found in the US. The names there seemed to be quite unusual - yet many more common names in the UK didn't appear to be on the list
My last name wasn't on the list, nor was the original Polish version of it. When I typed it in there was a boat load of family tree info, but no meaning for Peters. Seems pretty common too. Oh well. My boyfriend's was there though, his is Patrick.