Surname Gunaratnam (Gunaratnam 
) , all around the world, is quite a rare family name. The family name Gunaratnam is characteristic of Sri Lanka, where it is quite a rare surname, Malaysia, and Australia, where it is a rare surname. Much less frequently, Gunaratnam is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gunaratnam | Australia, Canada, United Kingdom, Sri Lanka, Malaysia |
| k. gunaratnam indian–Sri Lankan film producer (1917–1989) (b. 1917) |
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| rajalingam gunaratnam Malaysian sprinter, MY (b. 1941) |
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| lakshman gunaratnam researcher |
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| praveena gunaratnam researcher (ORCID 0000-0003-3280-5658) |
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