used unofficially from the first game in Los Angeles in
1967. Commissioner Pete Rozelle even held a contest
with media members to come up with a different
name, and it wasn't until two AFL-NFL Championship
games had been played before Rozelle decided to
officially call it the Super Bowl..."
http://www.breitbart.com/news/memories-of-50-super-bowls-and-how-the-game-was-named/
