Last name Onyai (Onyai 
) , across the world, is a rare family name. The surname Onyai is habitual in Uganda, where it is a rare surname, Thailand, where it is a very rare surname, and Nigeria. Also, Onyai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onyai | Thailand, Nigeria, Uganda |