Surname Pathmanathan (Pathmanathan 
) , in all the world, is quite a common cognomen. The cognomen Pathmanathan is characteristic of Sri Lanka, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Qatar. Not in comparison with a country's population, it is commonest in Sri Lanka, Malaysia, and the United Kingdom. Likewise, Pathmanathan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Pathmanathan | South Africa, Canada, United Kingdom, Sri Lanka, Malaysia |
| terry pathmanathan Singaporean footballer, SG (b. 1956) |
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| kylan pathmanathan researcher |
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| sevvel pathmanathan researcher |
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| siva gowri pathmanathan researcher (ORCID 0000-0001-5854-7904) |
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| nirmala pathmanathan researcher (ORCID 0000-0001-9225-139X) |
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| ishani pathmanathan researcher |
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| nallini pathmanathan Malaysian federal court judge, MY |
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| shayanthan pathmanathan D.Phil. University of Oxford 2002 |
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| k. pathmanathan |
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| r. sri pathmanathan |
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| ranganayaki pathmanathan |
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| devind pathmanathan cricketer, LK (b. 1995) |
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