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Cognomen Dianat (Dianat ) , all over the world, is a rare last name. The last name Dianat is habitual in Iran, where it is a rare surname, New Zealand, and Greece, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Iran, the United States, and Germany. Likewise, Dianat is the forename as well as the last name.