Surname Gaius (Gaius 
, Гай 
, גאיוס 
, and others...) , all over the world, is quite a common last name. The family name Gaius is characteristic of Papua New Guinea, where it is quite a rare surname, Gambia, and Ukraine. Not in comparison with a country's population, it most frequently occurs in Nigeria, Ukraine, and Russia. Also, Gaius is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gaius | Papua New Guinea, United States, Nigeria, Democratic Republic of the Congo, Cameroon |
| Гай | Ukraine, Kazakhstan, Armenia, Russia, Belarus |
| גאיוס | Israel |
| philip gaius |
|