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Family name Koul (Koul , Коул , Koulen ) , throughout the world, is a common last name. The family name Koul is habitual in Suriname, where it is quite a common surname, United Arab Emirates, where it is quite a rare surname, and Bahrain. Measured by absolute frequency, this name is the most popular in India, Algeria, and Cameroon. Very seldom, Koul is the forename as well as the last name.