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Cognomen Spiak (Spiak , Спяк ) , in the entire world, is a rare family name. The cognomen Spiak is habitual in Eastern Europe, particularly Slovakia, where it is quite a rare surname, Hungary, where it is a rare surname, and Ukraine. Not in comparison with a country's population, it is the most numerous in the United States, Slovakia, and Ukraine. Very seldom, Spiak is the forename as well as the last name.