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Cognomen Rohrer (Rohrer , Рорер , 罗勒) , all over the world, is a common surname. The cognomen Rohrer is habitual in Switzerland, where it is quite a common surname, Eswatini, and Liechtenstein (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in the United States, Switzerland, and Germany. Much less frequently, Rohrer is the forename as well as the last name.