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Surname คำขวัญ (Slogan , Khamhwan , Khamkwan ) , in the world, is a rare last name. The surname คำขวัญ is characteristic of Thailand, where it is a very rare surname, New Zealand, and Canada. In absolute terms, the name is most common in Thailand, the United States, and Myanmar. Very seldom, คำขวัญ is the forename as well as the last name.