Do the Andyar of the Blessed Lands have a particular physical trait that we may recognize (Illonians being average height and blonde, Cafelans being olive-skinned and dark haired, etc)?

That's a good question. Not sure if there is a real world analogue. Just because of the parallels with the "Holy Land" I envision something quasi Arabic. But that doesn't jibe with the few names we've gotten (and some Altherian names are already based on Arabic) ... regardless they a weathered and tough bunch to scratch out a living amid bandits and the kurenthe induced badland.