For some reason Paradox is using sen at the end of norwegian male last names, which is wrong, its supposed to be son, so for example the son of king Harald Haaraade, is named Magnus he should then be named Magnus Haraldsson not Magnus Haraldsen, this formula was basicly used on almost all norwegian males at this time, basicly the son takes his fathers first name as his last name, with son at the end. This can be seen in different Norwegian kings etc, for example Olav Tryggvason, Olav Haraldsson and Magnus Olafsson. Its pretty weird that you guys got this wrong but got female last names right :laugh: I guess its probally a typo or some missunderstanding but its really annoying, especially for norwegians i guess :mellow: