I'm thinking about football, the sport created more than 2000 years ago and named football since the XVIII century.
"The word "soccer" is actually British. It derives from the game's proper name, association football, with the "soc" bit taken from the word "association" . The reason it came into popular usage was simple: in the 19th century, football and rugby were both commonly known as football, the former dubbed "association football" and the latter "rugby football". But both phrases are a bit of a mouthful, however, so they were popularly shortened to "soccer" and "rugger" to keep things simple." Don't know how factual that is because I'm lazy but there.