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Surname Rumbai (Rumbai ) , in the world, is a rare family name. The family name Rumbai is habitual in Indonesia, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and Argentina. Not in comparison with a country's population, it is the most numerous in Indonesia, Malaysia, and India. Very seldom, Rumbai is the forename as well as the last name.