Last name Onyszkanycz (Onyszkanycz 
) , in all the world, is an extremely rare cognomen. The last name Onyszkanycz is habitual in Northern America, particularly Canada, where it is an extremely rare surname. Much more frequently, Onyszkanycz is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onyszkanycz | Canada, Poland |