Surname Ostasz (Ostasz 
) , around the world, is a rare family name. The cognomen Ostasz is characteristic of Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and Canada, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Poland, the United States, and the United Kingdom. More prevalently, Ostasz is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ostasz | United Kingdom, Poland, Ireland, United States, Canada |
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grzegorz ostasz Polish historian, PL (b. 1964) |
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| gustaw ostasz Polish literary historian, literary critic, PL (b. 1940) |
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| gustaw ostasz (b. 1940) |
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| agnieszka ostasz researcher, PL |
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