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Cognomen Буль (Bul , Buhl , Boul ) , across the world, is a common surname. The last name Буль is habitual in Denmark, where it is quite a common surname, Belize, and Germany, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Germany, the United States, and Denmark. Much less frequently, Буль is the forename as well as the last name.