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Surname Dej (เดช , ทรงเดช , Dej ) , globally, is quite a rare family name. The surname Dej is characteristic of Eastern Europe, particularly Slovakia, where it is quite a rare surname, Romania, where it is a rare surname, and Ukraine. Measured by absolute frequency, it is the most numerous in Russia, Thailand, and Ukraine. More frequently, Dej is the forename as well as the last name.