Do we know the names of any of the clans? The clans that went up into Sartar from Heortland had to originate from those that stayed behind, who are they? Then the rural areas are more Orlanthi than Aeolian. As the wars in Sartar sent refugees south, i think it's possible some where adopted into those clans instead of going to Refuge... or maybe those clans wanted nothing to do with them (I only say that as the descriptions of Refuge mention it's filled with refugees from the north.)