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Family name Kamsing (Kamsing , คำสิงห์) , in the world, is a rare last name. The family name Kamsing is habitual in Thailand, where it is a rare surname, Malaysia, where it is a very rare surname, and France, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Thailand, India, and France. More frequently, Kamsing is the forename as well as the last name.