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Family name รุ้ง (Rainbow , Rung , Rhung ) , in all the world, is a common surname. The surname รุ้ง is characteristic of Guernsey, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Hong Kong. In absolute terms, the name is most common in Malaysia, the United Kingdom, and Indonesia. Likewise, รุ้ง is the forename as well as the last name.