Family name Tančak (Tančak 
, Танчак 
) , around the world, is a rare last name. The cognomen Tančak is characteristic of Croatia, where it is quite a rare surname, Ukraine, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tančak | Croatia |
| Танчак | Kazakhstan, Russia, Ukraine |