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Family name Rahu (Rahu , ราหู ) , throughout the world, is quite a common cognomen. The surname Rahu is habitual in Estonia, where it is quite a common surname, Pakistan, where it is quite a rare surname, and Qatar. Not in comparison with a country's population, it is the most numerous in Pakistan, India, and Estonia. Very seldom, Rahu is the forename as well as the last name.