Don't be stupid, it's the name of the sport. Whilst soccer is indeed an English word (not an Americanism as some think) it is just the nickname for 'Association Football' as rugger is for Rugby football. Same construction. In Britain the word was used more in the past when the media was all run by Oxbrige types (as it is a snobby name invented by the Public School boys who used to play it, hence it's dislike by more ordinary fans). Nowadays it's more used by countries with more than one code of 'football' to differentiate between the sports.
Indeed. Even the IRISH call our game soccer.