Cognomen Njamu (Njamu 
) , in all the world, is a very rare last name. The cognomen Njamu is habitual in Sub-Saharan Africa, particularly Tanzania, where it is a very rare surname, Nigeria, and South Africa, where it is an extremely rare surname. More frequently, Njamu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Njamu | Indonesia, South Africa, Nigeria, Tanzania, India |