Football/Soccer, American/Gridiron Football, and Rugby all descend from the same class of sport that was just called football back in the middle ages (you playe

Football/Soccer, American/Gridiron Football, and Rugby all descend from the same class of sport that was just called football back in the middle ages (you played it on foot instead of on horse). Etymologically, neither sport called football really has any more claim to it than the other.