Where does “bulgăroaică” come from?

bulgăroaică (Romanian) comes from Romanian -oaică, from Slavic -ojka, from Old Czech ojě, from Proto-Slavic oje, from Proto-Indo-European h₂oyHsos.

Ancestry of “bulgăroaică”, step by step

StepLanguageWordMeaning
1Romanian-oaicăused to form the feminine of a masculine noun...
2Slavic-ojka—
3Old Czechojěthill
4Proto-Slavicojethill, shaft
5Proto-Indo-Europeanh₂oyHsos—
Every word from Proto-Indo-European h₂oyHsos →Every word from Proto-Slavic oje →Every word from Romanian -oaică →