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Surname Janney (珍妮 , ג'ני , Janney ) , in all the world, is quite a common last name. The cognomen Janney is habitual in Ghana, where it is quite a rare surname, the United States, where it is a rare surname, and New Zealand. Not in comparison with a country's population, this name is the most popular in China, the United States, and Ghana. More frequently, Janney is the forename as well as the last name.