Cognomen Namasivayam (Namasivayam 
) , across the world, is quite a rare surname. The surname Namasivayam is characteristic of Sri Lanka, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Singapore, where it is a rare surname. In absolute terms, this name is the most popular in Sri Lanka, Malaysia, and India. Much less frequently, Namasivayam is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Namasivayam | Sri Lanka, Malaysia, United States, India, Canada |
| namasivayam elangovan researcher ORCID ID = 0000-0002-9113-480X |
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| amrita namasivayam researcher |
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| nalini namasivayam researcher |
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| satesh narayana namasivayam researcher (ORCID 0000-0001-8523-0697) |
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| vigneshwaran namasivayam researcher |
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| aravind kumar namasivayam researcher (ORCID 0000-0002-9970-5478) |
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| sivaranjani namasivayam researcher (ORCID 0000-0001-9993-1347) |
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| namasivayam dhenadhayalan researcher |
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| mohan namasivayam D.Phil. University of Sussex 1985 |
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| namasivayam ambalavanan researcher |
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| mayooran namasivayam researcher (ORCID 0000-0001-8985-3947) |
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| harisankar namasivayam particle physicist |
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