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Family name Wanpen (วันเพ็ญ , Wanpen ) , all around the world, is quite a rare cognomen. The surname Wanpen is characteristic of Thailand, where it is quite a rare surname, Malaysia, where it is a very rare surname, and the United States, where it is an extremely rare surname. In absolute terms, this name is the most popular in Thailand, China, and Malaysia. Much more prevalently, Wanpen is the forename as well as the last name.
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