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Family name Ducat (Ducat , Ducato , דוקאט ) , in the world, is quite a rare last name. The cognomen Ducat is characteristic of the Democratic Republic of the Congo, where it is quite a rare surname, France, and Belgium, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in the Democratic Republic of the Congo, the United States, and France. Very seldom, Ducat is the forename as well as the last name.