Joktan fathered Almodad, Sheleph, Hazarmaveth, Jerah,
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 Joktan begat Almodad,.... And twelve more mentioned later: the Arabic writers (o) say be had thirty one sons by one woman, but all, excepting two, left Arabia, and settled in India; the Targum of Jonathan adds,"who measured the earth with ropes,''as if he was the first inventor and practiser of geometry: from him are thought to spring the Allumaeotae, a people whom Ptolemy (p)...
Joktan - He had thirteen sons who had their dwelling from Mesha unto Sephar, a mount of the east, which places Calmet supposes to be mount Masius, on the west in Mesopotamia, and the mountains of the Saphirs on the east in Armenia, or of the Tapyrs farther on in Media.