Cognomen Shanmugaratnam (Shanmugaratnam 
) , worldwide, is a rare family name. The family name Shanmugaratnam is habitual in Sri Lanka, where it is quite a rare surname, Singapore, where it is a rare surname, and Norway. Measured by absolute frequency, it is commonest in Sri Lanka, Canada, and Singapore. Likewise, Shanmugaratnam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Shanmugaratnam | Sri Lanka, Canada, Australia, Singapore, Germany |
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tharman shanmugaratnam Singaporean politician and economist, 5th and current Senior Minister of Singapore, SG (b. 1957) |
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| k. shanmugaratnam (b. 1921) |
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| yohan shanmugaratnam Norwegian journalist, LK (b. 1979) |
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