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Cognomen Juul (Juul , ユール, چول ) , in all the world, is quite a common surname. The family name Juul is characteristic of Northern Europe, particularly Denmark, where it is quite a common surname, Norway, and Estonia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Denmark, Norway, and the United States. Much less frequently, Juul is the forename as well as the last name.