Genesis 10:2 - Joseph Benson’s Commentary on the Old and New Testaments

Moses begins with Japheth's family, either because he was the eldest, or because it lay most remote from Israel, and had least concern with them at the time when he wrote; and therefore he mentions that race very briefly; hastening to give account of the posterity of Ham, who were Israel's enemies, and of Shem, who were Israel's ancestors: for it is the church of which the Scripture is designed to be the history: and of the nations of the world, only as they were some way or other interested in the affairs of Israel.