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Last name Rundi (润娣 , Rundi , 润弟 ) , across the world, is a rare cognomen. The cognomen Rundi is characteristic of Malaysia, where it is a rare surname, Tanzania, where it is a very rare surname, and Indonesia. Not in comparison with a country's population, it is the most numerous in China, Indonesia, and Malaysia. More prevalently, Rundi is the forename as well as the last name.