Surname Яня (Janja 
, Yanya 
, Яня 
) , throughout the world, is quite a rare family name. The last name Яня is characteristic of Slovenia, where it is quite a common surname, Bosnia and Herzegovina, where it is quite a rare surname, and Tanzania. Measured by absolute frequency, it most frequently occurs in Tanzania, Thailand, and Slovenia. More prevalently, Яня is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janja | Serbia, Croatia, Tanzania, India, Slovenia |
| Yanya | Turkey, China, Taiwan, Thailand, India |
| Яня | Kazakhstan, Russia, Ukraine, Bulgaria |
| Iania | China, Italy, United States, Greece, Brazil |