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Family name Diele (Diele , 迪勒) , in all the world, is quite a common last name. The last name Diele is habitual in the Democratic Republic of the Congo, where it is quite a rare surname, Cameroon, where it is a rare surname, and Netherlands. In absolute terms, the name is most common in the Democratic Republic of the Congo, Germany, and Italy. Much less frequently, Diele is the forename as well as the last name.