Quote Originally Posted by athanaric View Post
Same for the Persians, at least the Achaemenids. Dareios, Xerxes, and Artaxerxes are all titulary names.
Parthians too: Surena was the name of a clan. According to Wikipedia several later Roman histographers states that Surena also was a title, which was hereditary in a certain family. But maybe one of them just got it the wrong way round (the function became synonymous with the family) and the others copied this mistake from him.