Family name Santhanarajoo (Santhanarajoo 
) , around the world, is an extremely rare last name. The cognomen Santhanarajoo is habitual in South-eastern Asia, particularly Malaysia, where it is a very rare surname. Very seldom, Santhanarajoo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Santhanarajoo | Malaysia |