Where does “Kvasyliv” come from?

Kvasyliv (English) comes from Ukrainian Кваси́лів, from Ukrainian квас, from Old East Slavic квасъ, from Proto-Slavic kvasъ, from Proto-Indo-European kwh₂et- — to ferment, become sour; to boil, foam.

Ancestry of “Kvasyliv”, step by step

StepLanguageWordMeaning
1UkrainianКваси́лів—
2Ukrainianквасkvass
3Old East Slavicквасъ—
4Proto-Slavickvasъleaven, fermented drink
5Proto-Indo-Europeankwh₂et-to ferment, become sour; to boil, foam
Every word from Proto-Indo-European kwh₂et- →Every word from Proto-Slavic kvasъ →Every word from Old East Slavic квасъ →