Surname Demjanjuk (Демянюк 
, Demjanjuk 
, דמיאניוק 
) , globally, is quite a rare cognomen. The cognomen Demjanjuk is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Ukraine, and Russia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Демянюк | Kazakhstan, Russia, Ukraine, Belarus |
| Demjanjuk | Estonia, United States |
| דמיאניוק | Israel |
| Демьянюк | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| oryssja demjanjuk (b. 1992) |
|