Ashkenazi Jews Mizrahi Jews, implies that Ashkenazi Jews make up less than 74% of Jews worldwide. Other estimates place Ashkenazi Jews as making up about 75% of Jews worldwide. Genetic studies on Ashkenazim—researching both their paternal and maternal lineages—suggest a predominant amount of shared Middle Eastern ancestry, complemented by varying percentages of European admixture. These studies have arrived at diverging conclusions regarding both the degree and the sources of their European ancestry, and have generally focused on the extent of the European genetic origin observed in Ashkenazi maternal lineages. Ashkenazi Jews are popularly contrasted with Sephardi Jews (also called Sephardim), who descend
Ashkenazi Hebrew from Spain in 1492 (or before) the Sephardic pronunciation of the vowels became standard in all these countries, ironing out any differences that previously existed. This makes it harder to adjudicate between the different theories on the relationship between today's pronunciation systems and those of ancient times. Leopold Zunz believed that the Ashkenazi pronunciation was derived from that of Palestine in Geonic times (7th–11th centuries CE), while the Sephardi pronunciation was derived from that of Babylonia. This theory was supported by the fact that, in some respects, Ashkenazi Hebrew resembles the western dialect of Syriac while Sephardi Hebrew resembles the