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Cognomen Ngyen (Ngyen , Ngyễn ) , worldwide, is quite a rare last name. The last name Ngyen is habitual in Vietnam, where it is quite a rare surname, Canada, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, it is commonest in Vietnam, the United States, and Canada. Much less frequently, Ngyen is the forename as well as the last name.