Arpachshad fathered Shelah; and Shelah fathered Eber.
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 Arphaxad begat Salah,.... Or Shelach which signifies "a sending forth"; that is, of waters: it is part of the name of Methuselah, given him by his father, as prophetic of the flood, see Gen 5:21 and Arphaxad, who was born two years after the flood, gives this name to his first born, as commemorative of it: according to some, from him are the Susians...
Arphaxad--The settlement of his posterity was in the extensive valley of Shinar, on the Tigris, towards the southern extremity of Mesopotamia, including the country of Eden and the region on the east side of the river.