Family name Kumbai (Kumbai 
) , around the globe, is a very rare last name. The surname Kumbai is habitual in Thailand, where it is a very rare surname, Nigeria, where it is an extremely rare surname, and India. More frequently, Kumbai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kumbai | Philippines, India, Nigeria, United States, Thailand |