The Torah lists 70 descendants of Noach. Why are many omitted here, e.g. Yavan's sons Magog and Madai?
'Rashi': Here it merely mentions lineage. Only the heads of the nations are listed here 1 . Bnei Magog and Madai were called Kitim or Dodanim. Malbim - here it lists only four sons of Gomer, and four of Yavan, which became their own nations. Each had other sons, who were considered part of Gomer or Yavan.
It seems that also Radak says so, but there is a printing mistake in his words. (PF)
Here it says "Rodanim". In Bereishis 10:4, it says "Dodanim"!
'Rashi' (from Bereishis Rabah 37:1): When Yisrael sin, they are Rodeh (rule over) Yisrael. When Yisrael have the upper hand, they say "Bnei Dodeinu Atem" (you are our cousins)!
'Rashi': Initially they appeared like lovers 1 . In the end, they were Rodeh over Yisrael.
Radak: The forms of the letters Reish and Dalet are similar. People who looked in old lineage documents, some read it with Reish, and some with Dalet. Therefore, it is written like one of these in Bereishis, and like the other here, to teach that they are the same. We find similarly Re'u'el and De'u'el, Rivlasah and Divlasah. Also Yud and Vov appear similar (so sometimes a Yud is changed to a Vov when the name appears elsewhere. Also a silent Aleph at the end of a name is sometimes switched to Hei, for also it is silent, e.g. Savta and Savtecha 2 .
Malbim (5): When Ezra wrote Divrei ha'Yamim, they were called Dodanim.
I.e. we expound Dodanim like Dodim. (PF)
No verse writes Savtecha with a Hei, only in one version of Bereishis Rabah, one of Pesikta Zutresa, and in three Meforshim. Perhaps the text of Radak said Savta and Savtah (one written with an Aleph, like here, and one with a Hei, like Bereishis 10:7), and it was mistakenly copied Savtecha; Savta and Savtecha are both in verse 9. (PF)
