If you live in DeKalb County, home of Northern Illinois University, there is a strong chance your last name is Johnson, Miller or Johnson, but you will have to keep up with the Shroeders, Hansons, and the Frieders. The list is out of the most common last names of residents of DeKalb County...
Before you guess, some explanation of the question is in order. By "distinctive" last name, I mean those that occur most often compared to the nation as a whole. Got it? Okay, make your guess--but think "Swedish" while you're doing it.