Ok, so basically, what I learned from those entries: in 1876 someone changed the rules of the game, but forgot to change the name.
Re:How the feds took down FIFA
by riyadparvez on Saturday February 20, 2016 @04:58PM
(#11142144)
But also remembered to change the name of the original game.
https://en.wikipedia.org/wiki/American_football
https://en.wikipedia.org/wiki/History_of_American_football
These were found by typing "en.wikipedia.org/wiki/Football" into the browser's address bar and reading and browsing around to find the history and etymology.