Some very random Bozja NPC musings

The field notes on Fabineau quo Soranus state that he isn't related to Sartauvoir quo Soranus, it apparently is a common name in Mannatheihwo. So, does that mean that Julia and Annia are from Mannatheihwo as well, seeing as they are called quo Soranus as well? That might imply that they aren't just using Elezen bones, but are actual Elezen from a Garlean province that made it to bodyguards of the Emperor.

.... I really just wanna know more about Julia and Annia, seeing as the Tactics theories were a red herring.