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Cognomen Kooi (Coy , Койка , Kooi ) , throughout the world, is a common family name. The surname Kooi is characteristic of British Virgin Islands, where it is quite a common surname, Guatemala, and Malaysia (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Malaysia, the United States, and Indonesia. Very seldom, Kooi is the forename as well as the last name.