Family name Rengarajan (Rengarajan 
) , all around the world, is quite a rare last name. The cognomen Rengarajan is characteristic of Singapore, where it is quite a rare surname, United Arab Emirates, and Oman, where it is a rare surname. Not in comparison with a country's population, the name is most common in India, the United States, and Singapore. Likewise, Rengarajan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rengarajan | United Arab Emirates, Singapore, United States, India, Malaysia |
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t. k. rengarajan Indian communist politician and trade unionist, IN (b. 1941) |
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rengarajan jaiprakash Indian film producer, IN (b. 1974) |
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| thiruamali rengarajan (b. 1962) |
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| rajagopalan rengarajan researcher ORCID id 0000-0003-1860-7110 |
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| rengarajan srinivasan Ph.D. Carleton University 1988 |
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| rengarajan balamurugan researcher ORCID ID = 0000-0002-8373-5736 |
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| arvind rengarajan researcher |
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| thamaraiselvan rengarajan researcher |
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| jyothi rengarajan researcher |
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| rengarajan pelapur Ph.D. University of Missouri - Columbia 2016 |
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| n. r. rengarajan Indian politician, IN |
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| r. rengarajan researcher |
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| rengarajan rajagopal researcher |
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