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Surname Chirat (Chirat , จิรัตน์ , จิรัชย์ ) , globally, is quite a rare cognomen. The last name Chirat is characteristic of France, where it is quite a rare surname, Algeria, where it is a rare surname, and Armenia. Measured by absolute frequency, it is commonest in France, Algeria, and India. Also, Chirat is the forename as well as the last name.