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Last name Цьвяк (Цьвяк ) , around the world, is an extremely rare cognomen. The cognomen Цьвяк is habitual in Eastern Europe, particularly Ukraine, where it is a very rare surname.
Tsviak, and Tsvyak
Іван, Зенон, Ольга, Тарас, Роман, Маркіян, and Параскевія