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Cognomen Kusiak (Kusiak , Кусяк ) , throughout the world, is quite a common surname. The cognomen Kusiak is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Ukraine, and Slovakia. Not in comparison with a country's population, this name is the most popular in Poland, Ukraine, and the United States. Likewise, Kusiak is the forename as well as the last name.