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Surname Gratien (Gratien , กตัญญู ) , throughout the world, is quite a rare cognomen. The last name Gratien is characteristic of Guadeloupe, where it is quite a common surname, Rwanda, where it is quite a rare surname, and France. Measured by absolute frequency, it is commonest in Thailand, France, and Rwanda. More prevalently, Gratien is the forename as well as the last name.