Last name Sinnathamby (Sinnathamby 
) , globally, is quite a common family name. The cognomen Sinnathamby is characteristic of Malaysia, where it is quite a rare surname, Sri Lanka, and Norway. Measured by absolute frequency, this name is the most popular in Malaysia, Sri Lanka, and Canada. Much less frequently, Sinnathamby is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinnathamby | Australia, Malaysia, France, Canada, Sri Lanka |
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maha sinnathamby Australian-Malaysian businessman, AU (b. 1939) |
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| easan sinnathamby Canadian cricketer, CA (b. 1973) |
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| mary sinnathamby researcher |
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| mathuranthakan sinnathamby researcher |
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| sinnathamby t. ariaratnam Ph.D. University of Cambridge 1959 |
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