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Cognomen राजगुरु (Rajaguru , Rajguru , राजगुरु) , all around the world, is a common family name. The family name राजगुरु is habitual in Sri Lanka, where it is quite a common surname, India, where it is quite a rare surname, and United Arab Emirates. Very seldom, राजगुरु is the forename as well as the last name.