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Cognomen 서 (瑞 , 西 , 徐 , along with others...) , throughout the world, is a prevalent family name. The cognomen 서 is habitual in China, where it is a prevalent surname, South Korea, where it is a common surname, and U.S. Virgin Islands, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it is commonest in China, South Korea, and the United States. Much less frequently, 서 is the forename as well as the last name.