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Surname Mordechai (מרדכי , Mordechai , مردخاي , along with others...) , across the world, is quite a rare cognomen. The cognomen Mordechai is characteristic of Israel, where it is quite a common surname, Hungary, where it is quite a rare surname, and Greece, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Israel, Hungary, and the United States. More prevalently, Mordechai is the forename as well as the last name.