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Surname Opp (Opp , Upp , Опп ) , all over the world, is quite a common last name. The cognomen Opp is habitual in Estonia, where it is quite a rare surname, Germany, and Taiwan, where it is a rare surname. Not in comparison with a country's population, it is commonest in the United States, Germany, and India. Much less frequently, Opp is the forename as well as the last name.