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Cognomen Rungtam (Rungtam , รุ่งธรรม) , across the world, is an extremely rare surname. Much more frequently, Rungtam is the forename as well as the last name.
รุ่งทำ, รุ่งธำ, and รุ้งทำ
Ngodngamthaweesuk, and Chanamanee