Cognomen Kopai (Kopai 
, Копай 
) , throughout the world, is a rare surname. The surname Kopai is characteristic of Kyrgyzstan, where it is a rare surname, Myanmar, and Ukraine. Measured by absolute frequency, it is commonest in Myanmar, India, and Ukraine. Also, Kopai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kopai | South Africa, Malaysia, Australia, India, Myanmar |
| Копай | Kyrgyzstan, Kazakhstan, Ukraine, Russia |