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Family name Demay (Demay ) , worldwide, is quite a common cognomen. The cognomen Demay is characteristic of Guernsey, where it is quite a common surname, France, where it is quite a rare surname, and Belgium, where it is a rare surname. Measured by absolute frequency, the name is most common in France, the United States, and Belgium. Very seldom, Demay is the forename as well as the last name.