"So why are Europeans known as FrenchMEN, and EnglishMEN" I think only some are. And sometimes they need not be. For instance a Scot need not be a Scotsman he or she can just be a Scot. Likewise we wouldn't say Germanwoman we'd just say a German for either sex. Spaniard as opposed to Spanishman. Pole for Polish of either sex etc. Seems actually just more to be the British and some near neighbours who use the 'man' bit as part fo the noun itself. Frenchman, Dutchman etc.