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Last name Douk (Douk , Dōk, ดุ๊ก) , worldwide, is a rare surname. The cognomen Douk is habitual in Morocco, where it is quite a rare surname, Algeria, where it is a rare surname, and Greece. Measured by absolute frequency, it is the most numerous in Morocco, Algeria, and the United States. Much less frequently, Douk is the forename as well as the last name.