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Family name Дубий (Dubiy , Duby , Dubij ) , throughout the world, is quite a common cognomen. The surname Дубий is habitual in Israel, where it is quite a rare surname, France, and Belgium, where it is a rare surname. Measured by absolute frequency, this name is the most popular in India, the United States, and France. Much less frequently, Дубий is the forename as well as the last name.