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Cognomen Ngoc (Ngoc , Нгок , ゴック ) , worldwide, is a common last name. The cognomen Ngoc is habitual in Macao, where it is quite a common surname, Vietnam, and Malaysia, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Vietnam, Malaysia, and China. Likewise, Ngoc is the forename as well as the last name.