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Family name Khamphan (Khamphan , คำผัน, ขำพันธ์) , all over the world, is quite a rare surname. The cognomen Khamphan is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, Thailand, where it is a rare surname, and Malaysia, where it is a very rare surname. In absolute terms, it is commonest in Thailand, Laos, and the United States. Likewise, Khamphan is the forename as well as the last name.