I think the word 'soccer' was coined in the UK, to differentiate between Rugby football and Association football. The only other country I know of that uses the word soccer is Japan - well, 'sakkaa' actually, but the same idea.
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Yes, many American and European sports are quite popular in Japan. For instance, American football, regular football (you're welcome DL), and baseball.
Also @ meta, originally American football had alot more to do with using your feet, before the rules were changed.