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Surname Janner (Janner , ג'אנר , جانر) , all over the world, is quite a rare family name. The surname Janner is characteristic of Western Europe, particularly Austria, where it is quite a rare surname, Switzerland, where it is a rare surname, and Germany. Not in comparison with a country's population, it is commonest in Germany, Brazil, and the United States. Also, Janner is the forename as well as the last name.