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Throughout the world, 서 (瑞 , 西 , 徐 , along with others...) is a widespread gender-neutral given name. The given name 서 is habitual in Eastern Asia, particularly China, where it is quite a common epicene name, South Korea, where it is quite a rare principally feminine, but very infrequently male name, and Taiwan, where it is a rare unisex name. In absolute terms, it is commonest in China, South Korea, and Indonesia. More prevalently, 서 is the last name as well as the forename.
서 is also a name for the fictitious and mythical characters: Zhou Rui , the Dream of the Red Chamber Character.