The territory in which they lived extended from Mesha in the direction of Sephar to the hill country of the east.
Two things especially are observable in this account of the posterity of Shem: - I. The description of Shem, Gen 10:21. We have not only his name, Shem, which signifies a name, but two titles to distinguish him by: - 1. He was the father of all the children of Eber.
Commenting on Genesis 10:21-32
And their dwelling was from Mesha, as thou goest unto Zephar, a mount of the east. Mesha, which is thought to be the Muza of Ptolemy and Pliny, was a famous port in the Red sea, frequented by the merchants of Egypt and Ethiopia, from which the Sappharites lay directly eastward; to whose country they used to go for myrrh and frankincense, and the like...
Gen 10:30-31 The settlements of these Joktanides lay “from Mesha towards Sephar the mountain of the East,” Mesha is still unknown: according to Gesenius, it is Mesene on the Persian Gulf, and in Knobel's opinion, it is the valley of Bisha or Beishe in the north of Yemen; but both are very improbable.
Commenting on Genesis 10:30-31