Cognomen Rangarajan (Rangarajan 
) , globally, is quite a rare surname. The cognomen Rangarajan is characteristic of United Arab Emirates, where it is quite a rare surname, Singapore, and Oman, where it is a rare surname. In absolute terms, it is commonest in India, the United States, and United Arab Emirates. Likewise, Rangarajan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rangarajan | Singapore, India, United Arab Emirates, Australia, United States |
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mahesh rangarajan Indian historian and writer, IN (b. 1964) |
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vijay rangarajan British diplomat (-1969). Counsellor ( Political and Economic) and Deputy Head of Mission, Mexico 2003-2006, Director, Multilateral Policy, Foreign and Commonwealth Office 2011-2013, Director, European Union, Foreign and Commonwealth Office 2013|2016 (b. 1969) |
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swarnalatha rangarajan female educator from India (b. 1969) |
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| seshe iyengar rangarajan (b. 1916) |
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| ra. ki. rangarajan writer, IN (b. 1927) |
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rangarajan mohan kumaramangalam Indian politician (b. 1978) (b. 1978) |
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| g. n. rangarajan Indian writer (1930-2021), IN (b. 1930) |
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| lakshmi narasimhan rangarajan Indian diplomat, IN (b. 1934) |
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| s. rangarajan Indian journalist (b. 1936) |
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| haripriya rangarajan (b. 1936) |
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| rangarajan kumaramangalam Indian politician, IN (b. 1952) |
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| p. n. rangarajan Indian virologist, IN (b. 1963) |
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| nandhini rangarajan American political scientist |
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| akshaya rangarajan researcher (ORCID 0000-0001-6885-4879) |
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| anand rangarajan computer scientist |
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