(6) and (8) are Germans, most probably not known, though (6) is one of only five athletes so far winning gold at five different games. (6) is from my home town (Not that that helps much).

(10) has a really famous name as the response. He was a world famous athlete who has won several golds, she, his wife, was not famous outside of their country.

(12) The royal gold medalist was later king of his country.

So long til tomorrow

Wolfgang