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Last name เจียรนัย (เจียรนัย , Jiaranai , Jearanai ) , around the world, is quite a rare cognomen. The surname เจียรนัย is characteristic of Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Likewise, เจียรนัย is the forename as well as the last name.