The Khazar theory. This one always makes me laugh. Despite what many people think, only the Nobility of Khazar society converted to Judaism and the vast majority remained Tengriists. Even then the Ashina Clan of Khazar Nobility which was seen as sacred by Temgriists was still given a lot of reverence. What exactly happened next is a matter of debate. The Khazars definitely declined considerably over the generations. Eventually they were conquered and most converted to Islam. But there are two groups in Crimea that are kind of unique. The Karaites and this other group that translates to Black Hats who may be descended from the Khazars. Turkic speaking and still with distinct Asiatic features. On the other hand, Ashkenazi genetics seem to indicate that the majority of them are indeed of maternal Semitic descent but there are some people who do have Turkic Ancestry so I guess the Khazars did breed some with them. I also read something that said Ashkenazi Jews are some of the most inbred people on the planet. Which certainly explains Toms situation. I study Turkic and Mongolian history a lot, so sorry for sperging.