Last name Kanagaratnam (Kanagaratnam 
) , globally, is quite a rare cognomen. The cognomen Kanagaratnam is characteristic of Sri Lanka, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Norway, where it is a rare surname. In absolute terms, it is commonest in Sri Lanka, Malaysia, and Canada. Much less frequently, Kanagaratnam is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kanagaratnam | United Kingdom, Australia, Malaysia, Sri Lanka, Canada |
| kanagaratnam shanmugaratnam Singaporean pathologist, SG (b. 1921) |
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| kanagaratnam sriskandan British civil engineer, LK (b. 1930) |
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dinesh kanagaratnam Sri Lankan musician, IN (b. 1987) |
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| meneka kanagaratnam researcher |
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| kanagaratnam arunakirinathar Ph.D. University of Cape Town 1995 |
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| vinthan kanagaratnam Sri Lankan Tamil politician |
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| kanagaratnam jeyapalan researcher |
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| aran kanagaratnam researcher |
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| prapa kanagaratnam researcher (ORCID 0000-0003-3593-2185) |
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