That's nice. The factor is about 5000. Census records are used for howmanyofme.com (1990 and 2000) - there were 423,777 Robertses versus 2,406 Winers, and there were over 4,000,000 Michaels versus 82,000 Daves.
I'm sure there are "lots" of people with your name in the US, but you aren't named Michael Roberts. Trust me. I am unGoogleable.
BTW, there are lots of people with my name, exact same spelling, in the US.