How did the superbowl name has come?

It was agreed that the two leagues’ champion teams would play in an AFL–NFL World Championship Game, until the merger was consummated. After the merger of the two leagues in the 1970s, each league became a "conference", and the game was played between conference champions. Lamar Hunt, former owner of the Kansas City Chiefs and founding member of the American Football League, coined the name SuperBowl after watching his children playing with a Super Ball. The Super Bowl uses Roman numerals to identify each game, rather than the year in which it is held. Super Bowl I