New Defender's Study Bible Notes
10:21 Eber. The term “Hebrew” comes from Eber, but the descendants of Eber also include the “Habiru.” Discoveries at Ebla, in northern Syria, seem to indicate the founder and king of Ebla to be “Ebrim.”
10:21 Japheth. Japheth was evidently the oldest son of Noah, Ham the youngest (Genesis 9:24).