Having virtually no actual knowledge of the subject matter, I feel fully qualified to answer your questions.
Soccer - This sport was created in 879 BC in what would someday be known as "France" by local goatherders. The game began when Jean Claude kicked a spare goat head into Pierre's tent. Hostilities promptly broke out on all sides, even among those who had not been paying attention. Eager to recreate the experience, teams were formed, goats were beheaded, and the words, "Manchester United" were carved into the side of a nearby hill. This last bit resulted in a minor skirmish that consisted primarily of taunts, insults, and the occasional concussion.
Due to the fact that these early teams were made up of poor goatherders, they lacked the proper footwear. While some teams referred their to their stockings as hosiery, they were quickly battered by men who declared they wore socks. As a result, the sport became known as soccer and the Germans embraced lederhosen.
Rugby - This ancient sport dates back to 3762 BC in what would later become known as southern Wales. Thag killed a bear. Actually, he found it. It died when if fell off a cliff and landed on its head. Anyway, Thag hit it a few times just to make sure. Being a rather perceptive individual, Thag realized that there were some discernable differences between himself and the bear. It took him a few days to work it out. Eventually, he had a thought. The bear had fur it was no longer using and Thag, sadly, did not. Thag felt his bare scalp and rubbed the bear's lush fur. He did it again. Ok, he did it for about a week. At last, he tore off a small section of the bear's furry skin and placed it on his head.
Seeking to keep his new hairpiece in place, Thag had his friend, Ug hit it with a club. When Thag awoke, Ug had stolen his hair. The two battled over the tattered rug at great length until Thag finally succeed in nailing the swatch of fur to his own head.
Thus, the game of Rugby was born. In time, the game lost some of its earlier sophistication.
HTH.