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Cerny, is the 5th most common surname in the Czech Republic. It literally means black but probably originated describing men with dark hair or dark skin. Female form of the name is Cerna in the Czech language, but in English speaking countries like the United State, the male form, Cerny, is generally used for both men and women.
Jewish Surnames from Prague (15th - 18th Centuries)
by Alexander Beider shows Cerny and other variations as Jewish in origin