Family name Kovalčuk (Ковалчук 
, Kovalčuk 
) , all around the world, is quite a rare cognomen. The cognomen Kovalčuk is characteristic of Eastern Europe, particularly Russia, where it is quite a rare surname, Czechia, where it is a rare surname, and Ukraine, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ковалчук | Russia, Ukraine |
| Kovalčuk | Czechia |
| josef kovalčuk Czech member of Czech National Council and playwright (1948-2018), CZ (b. 1948) |
|