Surname Nkoja (Nkoja 
) , worldwide, is a rare cognomen. The cognomen Nkoja is characteristic of Sub-Saharan Africa, particularly Tanzania, where it is a rare surname, South Africa, and Nigeria, where it is an extremely rare surname. Much less frequently, Nkoja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nkoja | South Africa, Tanzania, Nigeria |