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Cognomen Koor (Kor , Koor , Chorus ) , all around the world, is a widespread surname. The surname Koor is habitual in Estonia, where it is quite a common surname, Singapore, and India, where it is quite a rare surname. Measured by absolute frequency, the name is most common in India, Bangladesh, and Malaysia. Much less frequently, Koor is the forename as well as the last name.