Adam Clarke on 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 the possibility of being recognized.