Across the world, Ratnarajah (Ratnarajah 
) is a rare masculine forename. The first name Ratnarajah is characteristic of Sri Lanka, where it is a rare male name, and the United Kingdom, where it is a very rare male name. More frequently, Ratnarajah is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ratnarajah | Malaysia, United Kingdom, Australia, Sri Lanka, Canada |
| sivapragasam ratnarajah Sri Lankan politician (1952-2008), LK (b. 1952) |
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| lavenia ratnarajah researcher |
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