Where does “Pyrih” come from?

Pyrih (English) comes from Ukrainian пиріг, from Old East Slavic пирогъ, from Proto-Slavic pirogъ, from Proto-Slavic pirъ — fest; party.

Ancestry of “Pyrih”, step by step

StepLanguageWordMeaning
1Ukrainianпирігpie, pastry; pierogi, dumpling, pelmeni
2Old East Slavicпирогъ—
3Proto-Slavicpirogъtype of pie?
4Proto-Slavicpirъfest; party
Every word from Proto-Slavic pirъ →Every word from Proto-Slavic pirogъ →Every word from Old East Slavic пирогъ →