The name "Corn Sky" first originated on Club Penguin on November 12, 2011, then in August 2013, he made a wiki about himself, and the name is still used today for his wiki. The name "Corn Sky" is also used for this wiki you are currently on right now.
The "North Aurora" username first originated on Wikia in January 2014 when he got an account rename. North Aurora's Wikia account actually was originally named Corn Sky, but he got a new name in January 2014 as it is still used today. His current username is named after a town called North Aurora in Illinois.