Cognomen Santhakumar (Santhakumar 
) , in all the world, is quite a rare family name. The last name Santhakumar is characteristic of Sri Lanka, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Qatar. Not in comparison with a country's population, it is the most numerous in India, Sri Lanka, and Malaysia. Likewise, Santhakumar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Santhakumar | Malaysia, India, United Arab Emirates, Australia, Sri Lanka |
| kirankumar santhakumar researcher |
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| cositha santhakumar researcher |
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| k. santhakumar General Manager of Reserve Bank of India, IN |
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| mohan santhakumar researcher |
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| abishek bommannan santhakumar researcher |
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| vijayalakshmi santhakumar researcher |
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