Where does “Tuomioja” come from?

Tuomioja (Finnish) comes from Finnish tuomi, from Finnish -lä, from Finnish -as, from Proto-Finnic -s, from Proto-Finno-Ugric -s.

Ancestry of “Tuomioja”, step by step

Tuomioja traces back through two separate lines of ancestry.

via Finnish tuomi

StepLanguageWordMeaning
1Finnishtuomibird cherry, hackberry, hagberry "Prunus padus";...
2Finnish-läFront vowel variant of -la
3Finnish-asForms some adjectives; Forms some nouns
4Proto-Finnic-sForms nouns
5Proto-Finno-Ugric-s

via Finnish oja

StepLanguageWordMeaning
1Finnishojaditch, trench; small natural brook
2Proto-Slavicojethill, shaft
3Proto-Indo-Europeanh₂oyHsos
Every word from Proto-Finno-Ugric -sEvery word from Finnish -läEvery word from Finnish -as