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Surname Kosko (Kosko , Косько , Коско ) , worldwide, is quite a rare cognomen. The last name Kosko is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Ukraine, and Slovakia, where it is a rare surname. Measured by absolute frequency, it is commonest in the United States, Belarus, and Ukraine. Very seldom, Kosko is the forename as well as the last name.