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Cognomen 段 (Dan , Duan , 段 ) , throughout the world, is a prevalent surname. The family name 段 is characteristic of Romania, where it is a common surname, China, and U.S. Virgin Islands (explore the name in all countries). Measured by absolute frequency, it is commonest in China, India, and Romania. Very seldom, 段 is the forename as well as the last name.