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Family name Chhum (ชุม , Chhum ) , in all the world, is a rare last name. The cognomen Chhum is characteristic of Cambodia, where it is a rare surname, New Zealand, and the United States, where it is a very rare surname. Not in comparison with a country's population, the name is most common in the United States, Cambodia, and France. More prevalently, Chhum is the forename as well as the last name.