Surname Onitsch (Onitsch 
) , globally, is a rare last name. The cognomen Onitsch is characteristic of Western Europe, particularly Austria, where it is quite a rare surname, and Switzerland, where it is a rare surname. Much less frequently, Onitsch is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onitsch | Austria, Switzerland, United States, Poland |
| cornelius onitsch |
|