Last name Sinnadurai (Sinnadurai 
) , in all the world, is quite a rare surname. The cognomen Sinnadurai is habitual in Malaysia, where it is quite a rare surname, Singapore, and Sri Lanka. Not in comparison with a country's population, it is the most numerous in Malaysia, Sri Lanka, and Canada. Much less frequently, Sinnadurai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sinnadurai | Malaysia, Australia, Singapore, Sri Lanka, Canada |
| sinnadurai vellupillai Singaporean hockey player, MY (b. 1926) |
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| siamala sinnadurai researcher |
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| manohan sinnadurai researcher |
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| gabrielle sinnadurai Ph.D. Imperial College London 1999 |
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