Family name Vanajah (Vanajah 
) , across the world, is a very rare last name. The surname Vanajah is habitual in South-eastern Asia, particularly Singapore, where it is a rare surname. Also, Vanajah is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vanajah | Canada, United Kingdom, United States, Malaysia, Singapore |
| s. vanajah Malaysian astronaut, MY (b. 1971) |
|