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Cognomen Denning (丹宁 , Denning , 丹寧) , around the world, is a common last name. The family name Denning is characteristic of Guernsey, where it is quite a common surname, Reunion, and Ireland, where it is quite a rare surname. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and China. Also, Denning is the forename as well as the last name.