Where does “runko-oja” come from?

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

Ancestry of “runko-oja”, step by step

runko-oja 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 runko

StepLanguageWordMeaning
1Finnishrunkotrunk; hull; body
2Proto-Finnicrunkabody, torso
Every word from Proto-Indo-European h₂oyHsos →Every word from Proto-Slavic oje →Every word from Finnish oja →
runko-oja — Etymology, Origin & Word History | Etymology Explorer