Heh, all of a sudden I have realized that a last name can uniquely identify you! My maiden name combination was so common, you'd have to know something about me to stalk me online. But now, as far as I can tell, I'm the only person at least that Google knows about with my first and last name.
I think there's one other person in the country with my first and last name. In Virginia, as I recall.
There are few enough of us that on several occasions we've all gotten calls when someone with our last name passed away without a next-of-kin. Couple hundred at most, I think...though my brothers are workin' on that...