The royal family names are screwed up, for example the current royal house of England in my game sounds Polish! Funnily enough, as France I got a RM with Austria and the next day my heir became Lois von Habsburg!
Well... Bernadotte isn't exactly a Swedish surname, but they have been the royal family for over 200 years now
IMHO that a polish noble can become king over England is one thing that makes HttT great!