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Family name Diederich (Diederich ) , around the world, is a common last name. The last name Diederich is habitual in Western Europe, particularly Luxembourg, where it is quite a common surname, Germany, where it is quite a rare surname, and Austria. Not in comparison with a country's population, the name is most common in Germany, the United States, and Luxembourg. Very seldom, Diederich is the forename as well as the last name.