Family name Onichtchouk (Онищук 
, Onichtchouk 
) , in the world, is a common cognomen. The last name Onichtchouk is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Russia.
| VARIANT | COUNTRY |
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| Онищук | Poland, Kazakhstan, Belarus, Russia, Ukraine |
| Onichtchouk | Germany, United States, Canada |
| daria onichtchouk researcher ORCID ID = 0000-0001-6497-1445 (b. 1965) |
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| d. onichtchouk researcher |
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