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Cognomen Proshak (Proshak
, Прошак
) , throughout the world, is a rare last name. The last name Proshak is characteristic of Eastern Europe, particularly Ukraine, where it is a rare surname, Belarus, and Russia, where it is a very rare surname. Measured by absolute frequency, it is commonest in Ukraine, Russia, and the United States. Much less frequently, Proshak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Proshak | Russia, Canada, India, United States, Ukraine |
| Прошак | Belarus, Russia, Ukraine |