Batman More Popular Than Professor X

How many different passwords do you use? More than a few, I'm sure. In this list of the 500 most common, several comic-related references show up including "Batman" at #31 and "Superman" at #47. "Xavier" comes in at #189, but I doubt those are all references to the famous mutant. Also on the list are "Snoopy", "Iceman" and the "Phantom".