Adam Clarke's Commentary on the Bible - Genesis 10:21
Shem also, the father of all the children of Eber - It is generally supposed that the Hebrews derived their name from Eber or Heber, son of Shem; but it appears much more likely that they had it from the circumstance of Abraham passing over (for so the word עבר abar signifies) the river Euphrates to come into the land of Canaan. See the history of Abraham, Genesis 14:13 ; (note). read more
Adam Clarke's Commentary on the Bible - Genesis 10:20
These are the sons of Ham after their families - No doubt all these were well known in the days of Moses, and for a long time after; but at this distance, when it is considered that the political state of the world has been undergoing almost incessant revolutions through all the intermediate portions of time, the impossibility of fixing their residences or marking their descendants must be evident, as both the names of the people and the places of their residences have been changed beyond... read more