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Last name Chamnan (Chamnan , ชำนาญ, จำนันต์) , worldwide, is quite a rare surname. The surname Chamnan is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname, Cambodia, where it is a rare surname, and Singapore. In absolute terms, the name is most common in South-eastern Asia, particularly Thailand, Cambodia, and Malaysia. Also, Chamnan is the forename as well as the last name.