Unto Shem also, &c.— It is observable that Moses introduces Shem in a particular manner, mentioning him as the father of the children of Eber, that is, more especially of that Hebrew race, Numbers 24:24 whose history he was about to compile. Eber, says Mr. Locke, signifies "beyond:" so that the sense of that text is, that Shem was the father of all those who dwelt beyond the river [Euphrates].
Related Commentaries of Genesis 10:21
Genesis 10:21
21 Unto Shem also, the father of all the children of Eber, the brother of Japheth the elder, even to him were children born.