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Cognomen Denniss (Denniss , เดนนิส ) , around the globe, is a rare last name. The last name Denniss is characteristic of Australia, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. In absolute terms, it most frequently occurs in Australia, the United Kingdom, and the United States. Very seldom, Denniss is the forename as well as the last name.