>>20485931Khazar theory is nonsense, and there's no evidence for it. We know the ancestral makeup of jews:
~30% native Israelite (the same thing as Samaritans)
~5% North African
The rest is European. They married Italians initially, apparently with Lambardic ancestry.
No evidence from genome-wide data of a Khazar origin for the Ashkenazi Jews
https://pubmed.ncbi.nlm.nih.gov/25079123/Did Modern Jews Originate in Italy?
New genetic study traces Ashkenazi roots to prehistoric Europe—not the Middle East
https://www.science.org/content/article/did-modern-jews-originate-italy>"The data are very convincing," says Antonio Torroni, a geneticist at the University of Pavia in Italy and a leading expert in the genetics of Europeans. He adds that recent studies of DNA from the cell nucleus have also shown "a very close similarity between Ashkenazi Jews and Italians.">The new data also put the nail in the coffin of another, highly controversial, hypothesis about Jewish ancestry: that the Ashkenazim actually descend from the Khazars, a Turkic people in Western Asia's Caucasus region whose rulers are known to have converted to Judaism in the 8th century C.E. That idea was promoted in a 2008 book by historian Shlomo Sand of Tel Aviv University in Israel. Ostrer and Behar found no such link, however, and Richards's team, which sampled mtDNAs from Asia and the Caucasus specifically to test this idea, also found no evidence for it. 
