Throughout the world, Ostaszewski (Ostaszewski 
) is an extremely rare boy's first name. Likewise, Ostaszewski is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ostaszewski | Poland, United States, Colombia, Germany, Canada |
| euzebi ostaszewski (b. 1756) |
|
|
| eliasz ostaszewski (b. 1802) |
|