The Jawwal are the Aserai mercenary company. The mercenary NPCs are, as far as I can tell, randomly generated the same way Wanderers/Companions are. I have had this happen in my game a time or two. The problem is that there is a small pool of names for the character generator to pick from, and no check for already-used names. If an NPC has a name without "the [Whatever]" (for Wanderers/Companions) or "of the [Whatever]" (for mercenaries) then that means they are pre-made vassals or rulers of the various factions (at least the faction and clan leaders are pre-made, I have seen one of them with two sons who had the same name so maybe family members are randomly generated? I have no idea). It would be better to just make sure that there are no duplicate names.
I think the solution for this is to either expand the pool of names, or implement a check so that each name is used once until after all names are used, or both.