Cognomen Ostrowskyj (Ostrowskyj 
) , all around the world, is a very rare family name. The family name Ostrowskyj is habitual in the United Kingdom, where it is a very rare surname, Canada, where it is an extremely rare surname, and Brazil. Measured by absolute frequency, it most frequently occurs in Brazil, the United Kingdom, and the United States. Very seldom, Ostrowskyj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ostrowskyj | Germany, Canada, Brazil, United Kingdom, United States |
Ostrovsky, Ostrovskyj, Островский, Островський, and אוסטרובסקי