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Family name Kuul (Kuul , Kūle , Кууль ) , throughout the world, is a rare surname. The cognomen Kuul is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname, Latvia, where it is a rare surname, and Sweden. Not in comparison with a country's population, it is commonest in Estonia, Tanzania, and Russia. Very seldom, Kuul is the forename as well as the last name.