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Cognomen 巽 (Tatsumi , 巽 ) , in the world, is quite a rare family name. The surname 巽 is habitual in Japan, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Singapore. Not in comparison with a country's population, it is the most numerous in Japan, China, and Indonesia. Likewise, 巽 is the forename as well as the last name.