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Surname Inson (อินสอน , Inson , อินสน ) , across the world, is quite a common last name. The last name Inson is characteristic of Philippines, where it is quite a rare surname, Thailand, and Qatar, where it is a rare surname. In absolute terms, it is the most numerous in South-eastern Asia, particularly Philippines, Thailand, and Malaysia. Much less frequently, Inson is the forename as well as the last name.