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Family name Riek (Riek , رياك ) , globally, is quite a rare cognomen. The last name Riek is characteristic of Liechtenstein, where it is quite a common surname, South Sudan, where it is quite a rare surname, and Sudan. Measured by absolute frequency, this name is the most popular in Germany, Sudan, and the United States. Much less frequently, Riek is the forename as well as the last name.