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Cognomen Zajac (Zajac , Zając , Заяц ) , all around the world, is a common family name. The last name Zajac is habitual in Eastern Europe, particularly Poland, where it is quite a common surname, Belarus, and Slovakia (explore the name in all countries). Measured by absolute frequency, the name is most common in Eastern Europe, particularly Poland, Russia, and Belarus. Likewise, Zajac is the forename as well as the last name.