Surname Jonja (Jonja 
) , in the world, is a rare cognomen. The last name Jonja is characteristic of Tanzania, where it is a rare surname, Brazil, where it is an extremely rare surname, and India. Likewise, Jonja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jonja | Australia, United States, Tanzania, India, Brazil |