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Last name Osch (Oesch , Osch ) , all over the world, is quite a common family name. The last name Osch is habitual in Western Europe, particularly Liechtenstein, where it is quite a common surname, Switzerland, and Luxembourg. Measured by absolute frequency, the name is most common in Switzerland, Netherlands, and the United States. Much less frequently, Osch is the forename as well as the last name.