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Surname Kalju (Калю , Kalju , Калью ) , in the entire world, is a rare last name. The surname Kalju is characteristic of Estonia, where it is quite a rare surname, Bulgaria, and Norway, where it is a rare surname. Not in comparison with a country's population, the name is most common in Bulgaria, Estonia, and Ukraine. Also, Kalju is the forename as well as the last name.