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Family name 坦 (Tan , 坦 ) , in all the world, is a prevalent surname. The family name 坦 is characteristic of Singapore, where it is a prevalent surname, Malaysia, where it is a widespread surname, and Bermuda (explore the name in all countries). Measured by absolute frequency, it is commonest in China, Malaysia, and Singapore. Very seldom, 坦 is the forename as well as the last name.