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Cognomen Dewan (Dewan , ديوان , دیوان) , around the globe, is a widespread last name. The last name Dewan is habitual in Nepal, where it is quite a common surname, Qatar, and Bangladesh (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Southern Asia, particularly Bangladesh, India, and Nepal. Likewise, Dewan is the forename as well as the last name.