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Surname राजन (Rajan , রাই , राजन ) , around the globe, is a widespread family name. The cognomen राजन is habitual in Western Asia, particularly United Arab Emirates, where it is a common surname, Oman, where it is quite a common surname, and Qatar (explore the name in all countries). Measured by absolute frequency, it is the most numerous in India, United Arab Emirates, and Saudi Arabia. More frequently, राजन is the forename as well as the last name.