Cognomen Ivanchak (Иванчак 
, Ivanchak 
) , in all the world, is a very rare last name. The family name Ivanchak is characteristic of Belarus, where it is a rare surname, Kazakhstan, and Russia, where it is a very rare surname. Much less frequently, Ivanchak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Иванчак | Belarus, Russia, Kazakhstan |
| Ivanchak | Russia, Ukraine, United States |