Worldwide, วันจา (Wanja 
, วันจา 
, Wanjah 
) is quite a rare largely female, but uncommonly male first name. The first name วันจา is characteristic of Kenya, where it is a rare female name, Sweden, and Tanzania. More prevalently, วันจา is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Wanja | Germany, United Arab Emirates, Kenya, Tanzania, Cameroon |
| วันจา | Thailand |
| Wanjah | South Africa, Kenya, Nigeria, Thailand, India |
| Whanja | United States, Democratic Republic of the Congo |