Where does “Sarjanoja” come from?

Sarjanoja (Finnish) comes from Finnish sarja, from Proto-Finnic sarja, from Proto-Finno-Permic śarja — lath, batten, bar.

Ancestry of “Sarjanoja”, step by step

Sarjanoja traces back through two separate lines of ancestry.

via Finnish sarja

StepLanguageWordMeaning
1Finnishsarjaseries; chain, sequence, succession, train; set
2Proto-Finnicsarjarow of laths or battens; a board made of laths
3Proto-Finno-Permicśarjalath, batten, bar

via Finnish oja

StepLanguageWordMeaning
1Finnishojaditch, trench; small natural brook
2Proto-Slavicojethill, shaft
3Proto-Indo-Europeanh₂oyHsos—
Every word from Proto-Finno-Permic śarja →Every word from Proto-Finnic sarja →Every word from Finnish sarja →