Surname Sundararaj (Sundararaj 
) , in all the world, is quite a rare cognomen. The surname Sundararaj is habitual in Sri Lanka, where it is quite a rare surname, United Arab Emirates, and Qatar, where it is a rare surname. Measured by absolute frequency, the name is most common in India, Sri Lanka, and Malaysia. Also, Sundararaj is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sundararaj | United Arab Emirates, United States, India, Sri Lanka, Malaysia |
| daniel sundararaj botanist (b. 1919) |
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| simon sundararaj Indian footballer and football manager, IN (b. 1937) |
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| sundararaj manickam (b. 1943) |
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| r. sundararaj Indian politician, IN (b. 1967) |
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| jenifer jeba sundararaj researcher (ORCID 0000-0002-7200-4452) |
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| uttandaraman sundararaj researcher |
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| s. sundararaj former Member of the Legislative Assembly, IN |
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| ananth i. sundararaj Ph.D. Northwestern University 2006 |
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| sundararaj niresh Sri Lankan association football player (b. 1998) |
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