According to slayer, the game was called 'soccer' BEFORE it was called 'football'.
1st . Association Football.
Now. Football (apart from countries where they already have football, where it is still called soccer)
1st. Football - the word football has been around for centuries
Then. Football Association formed
Now. Then soccer from the word 'Association' ('Assoc' - 'Assocer' - 'Soccer')