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Cognomen เดือนสวัสดิ์ (เดือนสวัสดิ์ , Soonsawad , Duandsawat) , in the entire world, is a very rare surname. The last name เดือนสวัสดิ์ is habitual in Thailand, where it is a rare surname, Finland, where it is a very rare surname, and the United States, where it is an extremely rare surname.