Cognomen Rasanayagam (Rasanayagam 
) , in the world, is quite a rare last name. The family name Rasanayagam is habitual in Sri Lanka, where it is quite a rare surname, Bahrain, and Norway, where it is a rare surname. Measured by absolute frequency, it is commonest in Sri Lanka, Bahrain, and Canada. Likewise, Rasanayagam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rasanayagam | United Kingdom, Sri Lanka, Canada, Malaysia, Bahrain |
| kingsley rasanayagam Member of Parliament, LK (b. 1941) |
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| johan rasanayagam (b. 1964) |
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