Bloody English don't even know their own history of "Soccer."
An excellent piece of research from the Yahoo sports hack.

Look up the Latin word 'soccus'.

Note the 'Castle soceries'?
The term does indeed precede 'football'. In the spirit of fairness, we'd be happy to oblige you and refer to football as soccer if you reciprocate and refer to your football as 'American rules rugby' and to baseball as rounders. We are also prepared to refer to netball as 'women's basketball'.
I trust that this is satisfactory.