Tafsiran Kejadian 10:2: Rashi, Chizkuni, Ramban & Radak

ותירס AND TIRAS — This is Persia (Yoma 10a).

ובני גומר וגו, “and the descendants of Gomer, etc;” the reason why the Torah does not mention by name the sons of Magog, Modai, Tuval Kayin, etc., is because none of them became founders of nations, so that only a single one of them became a founder of a nation. The same pattern is applied by the Torah when describing the offspring of Put son of Cham.

THE SONS OF JAPHETH: GOMER. Scripture begins with Japheth for he was the oldest. After him, it mentions Ham [even though he was the youngest]²⁶³See Ramban above, 6:10. for Scripture wanted to delay the account of the generations of Shem in order to place side by side the two sections dealing with Shem’s children since it is important to dwell at length on the generations of Abraham.