Cognomen Iscuk (Ищук 
, Iscuk 
) , all over the world, is quite a rare surname. The surname Iscuk is habitual in Belarus, where it is quite a rare surname, Russia, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Ищук | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Iscuk | Germany |