Last name Kwanja (Kwanja 
) , globally, is a rare surname. The cognomen Kwanja is habitual in Tanzania, where it is a rare surname, Thailand, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Much less frequently, Kwanja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kwanja | Nigeria, United States, Thailand, Tanzania |