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Last name Cush (Cush , كوش , Kushto ) , globally, is quite a common surname. The surname Cush is characteristic of Jordan, where it is quite a common surname, Reunion, and Ireland, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Jordan, Sudan, and the United States. Much less frequently, Cush is the forename as well as the last name.