Ever wonder why there were 10 girls in your class named Erin? BabyNameWizard.com's NameVoyager uses data from the Social Security Administration to give you the answer. NameVoyager is for new mommies and daddies who are eager to give Junior a name to remember. (Junior, by the way, is a name that spiked in popularity around 1920, crashed to earth and is now slowly returning to fashion.) But the real fun is entering the names of your friends to see what it reveals about them — or, more accurately, their parents.