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Around the globe, Haidan (海丹 , Haidan ) is a common epicene first name. The forename Haidan is habitual in China, where it is a rare unisex name, Tanzania, where it is a rare masculine name, and the United States, where it is an extremely rare dominantly feminine, but uncommonly masculine name. Not in comparison with a country's population, this name is the most popular in China, Tanzania, and India. Very seldom, Haidan is the last name as well as the forename.