Surname Somanathan (Somanathan 
) , worldwide, is quite a rare last name. The family name Somanathan is characteristic of Sri Lanka, where it is quite a common surname, United Arab Emirates, where it is quite a rare surname, and Oman, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Sri Lanka, India, and United Arab Emirates. Also, Somanathan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Somanathan | Malaysia, India, United Arab Emirates, Sri Lanka, Oman |
| valampuri somanathan tamil scholar and poet, IN (b. 1928) |
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| rohini somanathan economist (University of Delhi) (b. 1965) |
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| t. v somanathan IN (b. 1965) |
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| hema somanathan researcher (ORCID 0000-0002-4803-3894) |
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| eswaran somanathan Ph.D. Harvard University 1995 |
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| thara somanathan |
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