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Last name Coan (科恩 , Coan , Кон ) , around the globe, is quite a common cognomen. The family name Coan is habitual in Bermuda, where it is quite a common surname, the United States, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, the name is most common in the United States, Brazil, and Russia. Much less frequently, Coan is the forename as well as the last name.