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Surname Ergang (二刚 , Ergang , 尔刚 ) , across the world, is quite a rare family name. The surname Ergang is habitual in Slovakia, where it is a rare surname, Canada, and Germany, where it is a very rare surname. Measured by absolute frequency, the name is most common in China, Brazil, and the United States. More frequently, Ergang is the forename as well as the last name.