But I'd like to refrain from using any national denomination, and instead just list the versions of the name. What is wrong with that? Tvrtko's real name was Stefan. And that was over 600 years ago, Stefan wasn't simply a Serbian name - Tvrtko wasn't a Serb and yet he wore it. There's also even a Serb named Stjepan (Stjepan Mitrov Ljubisa) from the 19th century.