Surname Ratnasiri (Ratnasiri 
) , all over the world, is quite a rare last name. The last name Ratnasiri is habitual in Sri Lanka, where it is quite a rare surname, the United Kingdom, where it is an extremely rare surname, and Canada. In absolute terms, it is the most numerous in Sri Lanka, the United Kingdom, and the United States. Much less frequently, Ratnasiri is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratnasiri | United Kingdom, Sri Lanka, Australia, United States, Canada |
| ratnasiri rajapakse LK (b. 1938) |
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| anura w g ratnasiri researcher |
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| w.k. ratnasiri (b. 1971) |
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