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Last name Sirko (Sirko , Сирко , Серко ) , in the world, is quite a common family name. The cognomen Sirko is characteristic of Belarus, where it is quite a rare surname, Ukraine, and Bosnia and Herzegovina. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Ukraine, Belarus, and Russia. Very seldom, Sirko is the forename as well as the last name.