Surname Gvai (Гвай 
, Gvai 
) , around the globe, is a rare cognomen. The family name Gvai is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Ukraine, where it is a rare surname, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Гвай | Russia, Ukraine, Kazakhstan, Belarus |
| Gvai | Russia, India |