Wiernik is a Polish surname. Archaic feminine forms: Wiernikowa (by husband), Wiernikówna (by father).WIERNIK. Notable people with the surname include:
Bertha Wiernik (1884–1951), Lithuanian-born American writer Jankiel Wiernik (1889–1972), Polish-Jewish Holocaust survivor Peter Wiernik (1865–1936), Russian-born Jewish American Yiddish journalist, newspaper editor, writer and historian
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