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Last name Buyko (Buyko , Буйко , Буыко ) , in the world, is quite a rare surname. The cognomen Buyko is characteristic of Belarus, where it is quite a common surname, Kazakhstan, where it is a rare surname, and Russia. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Belarus, Russia, and Ukraine. Much less frequently, Buyko is the forename as well as the last name.