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Cognomen Bajaj (Bajaj , Баджадж , بجاج ) , around the world, is a widespread surname. The last name Bajaj is habitual in Singapore, where it is quite a common surname, United Arab Emirates, and India, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in India, Singapore, and the United States. Much less frequently, Bajaj is the forename as well as the last name.