(Name translates directly from ancient Egyptian as: Strong Protector, the Hidden One.) A mysterious shaman appearing without regard to wheres and whens, upon the divine bidding of other Realms. An entity of legend, belonging to a legendary and ancient sect.
Surnames: The Chinese were among the very first cultures to adopt the use of hereditary surnames (around 2800 BC). But the custom didn't quite catch on in Europe - at least not until the Venetian aristocracy made it popular sometime between the 10th and 11th centuries AD. What culture made it popular in your setting and why?