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Around the globe, Калю (Калю , Kalju , Kalyu ) is a rare principally male, but very seldom feminine given name. The first name Калю is habitual in Estonia, where it is quite a rare male name, Bulgaria, and Sweden, where it is a rare boy's name. Measured by absolute frequency, it is the most numerous in Bulgaria, Estonia, and India. Also, Калю is the last name as well as the forename.