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Cognomen Denney (丹尼 , Denney , デニー ) , throughout the world, is a common surname. The cognomen Denney is habitual in Jersey, where it is quite a common surname, the United States, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Canada. Very seldom, Denney is the forename as well as the last name.