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Cognomen Niratn (Niratn ) , in all the world, is an extremely rare family name. Much more prevalently, Niratn is the forename as well as the last name.
ณิรัตน์, นิรัฒน์, นิรัตน, นิรัตน์, อณิรัตน์, and อนิรัตน์