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Family name Diagne (Diagne , ديان , 迪昂 ) , all around the world, is a widespread last name. The last name Diagne is habitual in Sub-Saharan Africa, particularly Senegal, where it is a widespread surname, Mauritania, where it is quite a common surname, and Gabon, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Senegal, France, and the Democratic Republic of the Congo. Very seldom, Diagne is the forename as well as the last name.