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Cognomen Lạc (Lạc , Лак ) , across the world, is a rare last name. The family name Lạc is habitual in Vietnam, where it is a rare surname, Belarus, where it is a very rare surname, and Kyrgyzstan. Not in comparison with a country's population, it is commonest in Vietnam, Russia, and Belarus. Likewise, Lạc is the forename as well as the last name.