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Family name Korko (Cork , Korko , Корко ) , in the entire world, is quite a common cognomen. The family name Korko is characteristic of Northern Europe, particularly Jersey, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United Kingdom. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Kenya. Very seldom, Korko is the forename as well as the last name.