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Last name Dem (Dem , دم , ديم ) , in all the world, is a common surname. The last name Dem is characteristic of Bhutan, where it is a common surname, Gambia, where it is quite a common surname, and Mauritania, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Bhutan, Mali, and Algeria. Also, Dem is the forename as well as the last name.