Where does “Грищук” come from?

Грищук (Ukrainian) comes from Ukrainian ук.

Ancestry of “Грищук”, step by step

Грищук traces back through two separate lines of ancestry.

via Ukrainian ук

StepLanguageWordMeaning
1Ukrainianук

via Ukrainian Гри́сь

StepLanguageWordMeaning
1UkrainianГри́сь
Every word from Ukrainian ук