Around the world, Onjo (Onjo 
) is a rare unisex given name. The forename Onjo is habitual in Indonesia, where it is a very rare unisex name, Japan, where it is a very rare masculine name, and India, where it is an extremely rare primarily female, but scarcely boy's name. More frequently, Onjo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Onjo | China, Nigeria, Indonesia, India, Japan |