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Surname Chairat (ชัยรัตน์ , Chairat , ไชยรัตน์ ) , in the entire world, is a common cognomen. The cognomen Chairat is characteristic of Thailand, where it is quite a common surname, Tunisia, where it is quite a rare surname, and Laos. Not in comparison with a country's population, it is commonest in Thailand, Indonesia, and Tunisia. More frequently, Chairat is the forename as well as the last name.