Originally Posted by MrG
That's also true. They called it that because there was another type of football, as well.
Again, removing ambiguity is a good thing.
There still is another football, genius. It's called rugby football. American football is derivative of that sport, hence why you call it football.
If you wanted to reduce ambiguity, I would recommend using the term as it is used globally in about 100 different countries, rather than as it is in your little corner of the world.