Where does “Pajuoja” come from?

Pajuoja (Finnish) comes from Finnish oja, from Proto-Slavic oje, from Proto-Indo-European h₂oyHsos.

Ancestry of “Pajuoja”, step by step

Pajuoja traces back through two separate lines of ancestry.

via Finnish oja

StepLanguageWordMeaning
1Finnishojaditch, trench; small natural brook
2Proto-Slavicojethill, shaft
3Proto-Indo-Europeanh₂oyHsos—

via Finnish paju

StepLanguageWordMeaning
1Finnishpajuwillow
2Proto-Finnicpajuwillow
3Proto-Uralicpajiwwillow
Every word from Proto-Indo-European h₂oyHsos →Every word from Proto-Slavic oje →Every word from Finnish oja →