Last name Soundararajan (Soundararajan 
) , across the world, is quite a common cognomen. The family name Soundararajan is habitual in Sri Lanka, where it is quite a rare surname, Iceland, and Kenya. In absolute terms, it is the most numerous in India, Sri Lanka, and Kenya. Much less frequently, Soundararajan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Soundararajan | United States, Kenya, Nepal, Sri Lanka, India |
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t. m. soundararajan Indian singer, IN (b. 1922) |
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soundararajan bangarusamy Indian businessman, IN (b. 1961) |
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| k. v. soundararajan Indian archaeologist, IN (b. 1925) |
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thenmozhi soundararajan American songwriter, US |
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| niranjan soundararajan Ph.D. The Pennsylvania State University 2010 |
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| soundararajan kamalakkannan researcher (ORCID 0000-0002-7434-1831) |
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| balaji soundararajan aerospace engineer |
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| soundararajan srinivasan Ph.D. The Ohio State University 2006 |
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| soundararajan ezekiel Ph.D. University of Pittsburgh 2000 |
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| vidhya soundararajan researcher |
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| venky soundararajan researcher |
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| vivek soundararajan researcher, ORCID id # 0000-0002-8966-9725 |
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| n. soundararajan Indian politician, IN |
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| k. soundararajan Indian politician, IN |
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| dilip chand raja soundararajan researcher (ORCID 0000-0002-8254-3580) |
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