Three sons of Gomer are mentioned in Genesis 10, namely
Ashkenaz Riphath (spelled Diphath in I Chronicles) Togarmah
Children of Ashkenaz were originally identified with the Scythians (Assyrian Ishkuza), https://upload.wikimedia.org/wikipedia/commons/d/d5/Scythian_culture.jpg
then after the 11th century, with Germany.[15][16] https://pic8.co/sh/pANSbI.jpg (???)
Ancient Armenian and Georgian chronicles lists Togarmah as the ancestor of both people who originally inhabited the land between two Black and Caspian Seas and between two inaccessible mountains, Mount Elbrus https://pic8.co/sh/2cEdyY.jpeg and Mount Ararat https://pic8.co/sh/43AiHp.png respectively.[17][18]
According to Khazar records, Togarmah is regarded as the ancestor of the Turkic-speaking peoples.[19]
https://en.wikipedia.org/wiki/Khazars
Linguistic and genetic studies have not supported the theory of a Khazar connection to Ashkenazi Jewry. The theory still occasionally finds support, but most scholars view it with considerable skepticism.[24][20][25] The theory is sometimes associated with antisemitism[26] and anti-Zionism.[27]
https://en.wikipedia.org/wiki/Genetic_studies_on_Jews#Maternal_line
According to Thomas et al. in 2002, a number of Jewish communities reveal direct-line maternal ancestry originating from a few women. This was seen in independently founded communities in different geographic areas. What they shared was limited genetic additions later on the female side. Together, this is described as the founder effect. Those same communities had diversity in the male lines that was similar to the non-Jewish population.[64] Two studies in 2006 and 2008 suggested that about 40% of Ashkenazi Jews originate maternally from just four female founders who were likely of Near-Eastern origin, while the populations of Sephardi and Mizrahi Jewish communities "showed no evidence for a narrow founder effect".[65][62]
Is there any proof that the Gentiles are descendants of Japheth? And if they are, how does this change Christianity?
Technically, a Gentile is anyone who is not of Jewish(descendants of Judah)/Israelite descent. This would include Ham’s, Japheth’s, and even some of Shem’s descendants. Arabs, for example, are Gentiles even though they are descendants of Shem.
(It is very difficult to determine who the Israelites are any more. They were the descendants of the ten northern tribes of Israel. When they were taken in bondage by the Assyrians, they intermingled with many foreign peoples, so when they came back to resettle in “Israel”, they were spurned by the Jews, the descendants of the tribes of Judah and Benjamin. Benjamin was a small tribe surrounded by Judah, into whom they eventually became absorbed. This is why the Apostle Paul, who was a Benjamite, could also claim to be a Jew. The ten northern tribes were not “Jewish” even though they practiced a form of Judaism. These people, after their return from Assyria, became the Samaritans, a group despised by the (southern) Jews, not only for their mixed blood, but their syncretistic religious practices.)
The descendants of Ham and Japheth are Gentiles. This doesn’t change Christianity at all. Why would it?
...
https://biblehub.com/amp/genesis/10.htm
Descendants of Noah
1These are the records of the generations (descendants) of Shem, Ham, and Japheth, the sons of Noah; and the sons born to them after the flood:
2the sons of Japheth: Gomer, Magog, Madai, Javan, Tubal, Meshech, and Tiras; 3the sons of Gomer: Ashkenaz, Riphath, and Togarmah; 4the sons of Javan: Elishah, Tarshish, Kittim, and Dodanim. 5From these, [the people of] the coastlands of the nations were separated and spread into their lands, every one [a]according to his own language, according to their constituent groups (families), and into their nations:
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