Surname Ostashko (Ostashko 
) , in the world, is a very rare cognomen. The last name Ostashko is habitual in Czechia, where it is a rare surname, Georgia, where it is a very rare surname, and Russia. In absolute terms, it most frequently occurs in Russia, Czechia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Ostashko | Germany, Russia, Czechia, United States, Ukraine |
| fedir ivanovych ostashko (b. 1928) |
|
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| tetiana ostashko Ukrainian historian (b. 1960) |
|