Family name Kasovskiy (Kasovskiy 
, Касовский 
) , worldwide, is a very rare last name. The surname Kasovskiy is characteristic of Belarus, where it is a very rare surname, Russia, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kasovskiy | United States |
| Касовский | Russia, Belarus |