As I noted at the time, the United States is a nation of 300 million people. They aren't all named Fred Jones. Assuming that a name is fake just because it is unusual, or "funny," or the same as the name of a celebrity, is nothing short of stupid.
Unfortunately, that's a lesson some people have to learn the hard way. Jed L at Daily Kos points out that the National Review's Jim Geraghty made a fool of himself by mocking American Prospect writer Adam Serwer based on just such an assumption:
Now, unless A. Serwer thinks that there is actually a registered voter named "Duran Duran" in New Mexico, he ought to refrain from sputtering that those who disagree with him are 'racist' and 'paranoid.'