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In all the world, Sŏ (徐 , 서 , Sŏ) is a common gender-neutral forename. The first name Sŏ is habitual in Eastern Asia, particularly China, where it is quite a rare epicene name, and South Korea, where it is a rare male name. Much more prevalently, Sŏ is the last name as well as the forename.
Sŏ is also a name for the fictitious and mythical characters: Zhou Rui , the Dream of the Red Chamber Character.