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Surname 瞳 (瞳 , Hitomi ) , all around the world, is quite a common cognomen. The last name 瞳 is habitual in Eastern Asia, particularly China, where it is a rare surname, Japan, and Hong Kong. Not in comparison with a country's population, it is the most numerous in China, Japan, and Indonesia. More frequently, 瞳 is the forename as well as the last name.