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Last name 單 (Toa , 單 , តួ ) , in all the world, is a common family name. The surname 單 is habitual in Vanuatu, where it is a common surname, Cambodia, where it is quite a rare surname, and Papua New Guinea. Not in comparison with a country's population, it is the most numerous in China, Indonesia, and Ivory Coast. Likewise, 單 is the forename as well as the last name.