Surname oniszk

Has anyone got any idea where this surname originates? im guessing its a Slavic country

i have two friends(brothers) with this surname from my school years and i was curious

may be polish. there are 420 ppl with this surname in PL

It is derived from the Ukrainian first name Onysym (borrowed centuries ago from a Greek name meaning useful). It appears in surnames in various forms (Onisko, Onyszczyk, Onyszkiewicz, etc.) throuhgout the Slavonic nations.

thanks as Google could not find much on the name its self