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Cognomen Pozniak (Pozniak , Позняк , Позниак ) , worldwide, is a common surname. The last name Pozniak is habitual in Eastern Europe, particularly Belarus, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Poland. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Belarus, Ukraine, and Russia. Very seldom, Pozniak is the forename as well as the last name.