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Cognomen ลำเพ็ญ (Lamphen , Lampen , ลำเพ็ญ) , across the world, is quite a rare surname. The family name ลำเพ็ญ is habitual in Finland, where it is quite a common surname, Netherlands, where it is a rare surname, and Zambia. In absolute terms, the name is most common in Finland, Germany, and the United States. Much less frequently, ลำเพ็ญ is the forename as well as the last name.