According to a 2016 report by Das et al. published in Genome Biology and Evolution journal, “Yiddish is a Slavic language created by Irano-Turko-Slavic Jewish merchants along the Silk Road” with German and Hebrew elements added post 9^th century…

In another 2016 report by Univ. of Sheffield prof. Eran Elhaik published in Genome Biology and Evolution journal, one notes:

“Contemporary Eastern European Jews comprise the largest ethno-religious aggregate of modern Jewish communities, accounting for nearly 90% of over 13 million Jews worldwide”… Elhaik’s study supports the Khazarian Hypothesis which “considers Eastern European Jews to be the descendants of Khazars…The Khazars were a confederation of Slavic, Scythian, Hunnic-Bulgar, Iranian, Alans, and Turkish tribes who formed in the central-northern Caucasus one of most powerful empires during the late Iron Age and converted to Judaism in the 8^th century CE”… 

Recall that the Scythians, Bulgarians, and Alans are all members of the Iranian tribes… so Elhaik should have said:  “The Khazars were a confederation of Slavic, Hunnic, Iranian, and Turkish tribes”…

[pic source bibliotecapleyades: for educational purposes only]