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, Slovenia, India |
| Yanya | Thailand, China, Taiwan, India, Turkey |
| Яня | Kazakhstan, Russia, Bulgaria, Ukraine |
| Iania | Brazil, China, Greece, United States, Italy |