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Last name Delfosse (Delfosse ) , around the world, is quite a common surname. The last name Delfosse is habitual in Western Europe, particularly Belgium, where it is quite a common surname, France, where it is quite a rare surname, and Luxembourg. Measured by absolute frequency, this name is the most popular in France, Belgium, and the United States. Very seldom, Delfosse is the forename as well as the last name.