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Surname Cornu (Corn , Cornu , Corno ) , around the globe, is a common last name. The surname Cornu is characteristic of Jersey, where it is a common surname, Guernsey, where it is quite a common surname, and France (explore the name in all countries). Measured by absolute frequency, the name is most common in France, the United States, and Italy. Very seldom, Cornu is the forename as well as the last name.