Surname Gromadskiy (Gromadskiy 
, Громадский 
) , throughout the world, is a rare cognomen. The surname Gromadskiy is habitual in Belarus, where it is a rare surname, Russia, and Kazakhstan, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Gromadskiy | Ukraine, United States |
| Громадский | Kazakhstan, Russia, Ukraine, Belarus |