Last name Navaratnam (Navaratnam 
) , worldwide, is quite a common cognomen. The cognomen Navaratnam is habitual in Sri Lanka, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Australia, where it is a rare surname. Not in comparison with a country's population, the name is most common in Sri Lanka, Malaysia, and Canada. Also, Navaratnam is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Navaratnam | Australia, Malaysia, India, Canada, Sri Lanka |
| ramon navaratnam Malaysian politician and economist, MY (b. 1935) |
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| suresh navaratnam Malaysian cricketer, MY (b. 1975) |
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| v navaratnam researcher |
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| manchula navaratnam researcher |
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| kate navaratnam researcher (ORCID 0000-0003-0888-1650) |
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| anojan navaratnam researcher (ORCID 0000-0003-4684-0235) |
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| dhasakumar navaratnam researcher |
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| jesintha navaratnam researcher (ORCID 0000-0002-0561-6256) |
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| annakan victor navaratnam researcher |
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| satheeskumar navaratnam researcher |
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| annalan md navaratnam researcher |
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| ratna navaratnam |
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| rohan shan tze navaratnam chess player |
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