Jewish diaspora evidence that about 40% of Ashkenazi Jews originate maternally from just four female founders, who were of Middle Eastern origin. The populations of Sephardi and Mizrahi Jewish communities "showed no evidence for a narrow founder effect." Subsequent studies carried out by Feder et al. confirmed the large portion of the non-local maternal origin among Ashkenazi Jews. Reflecting on their findings related to the maternal origin of Ashkenazi Jews, the authors conclude "Clearly, the differences between Jews and non-Jews are far larger than those observed among the Jewish communities. Hence, differences between the Jewish communities can be overlooked when non-Jews are
Sephardi Hebrew the Ashkenazi pronunciation was derived from that of Palestine in Geonic times (7th-11th centuries) and that the Sephardi pronunciation was derived from that of Babylonia. The theory was supported by the fact that in some respects, Ashkenazi Hebrew resembles the western dialect of Syriac, and Sephardi Hebrew resembles the eastern dialect: Eastern Syriac "Peshitta" as against Western Syriac "Peshito". Ashkenazi Hebrew, in its written form, also resembles Palestinian Hebrew in its tendency to "malē" spellings (see Mater lectionis). Others, including Abraham Zevi Idelsohn, believed that the distinction is more ancient and represents the distinction between the Judaean and Galilean dialects