Family name Koltchak (Koltchak 
, Колчак 
, Кольчак 
) , around the world, is a rare last name. The family name Koltchak is habitual in Ukraine, where it is quite a rare surname, Russia, where it is a rare surname, and Kazakhstan, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koltchak | United States, France |
| Колчак | Russia, Ukraine |
| Кольчак | Kazakhstan, Russia, Ukraine |