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Surname Isko (Isko , Иско , Исько ) , all over the world, is quite a rare cognomen. The last name Isko is habitual in Morocco, where it is quite a rare surname, Algeria, where it is a rare surname, and Bulgaria. Measured by absolute frequency, it is the most numerous in Morocco, Algeria, and Russia. Likewise, Isko is the forename as well as the last name.