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Last name Costen (Kosti
, Costen
) , across the world, is quite a rare surname. The family name Costen is habitual in Cyprus, where it is quite a common surname, Guernsey, and Greece, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in India, Greece, and the United States. Much less frequently, Costen is the forename as well as the last name.