Where does “suojapuusto” come from?

suojapuusto (Finnish) comes from Finnish suoja, from Proto-Finnic sooja, from Russian со́я, from Dutch soja, from Japanese そい, from Japanese 醤油, from Middle Chinese 醬油, from Middle Chinese 醬 — bean paste.

suojapuusto (Finnish): tree cover to protect plants, etc

Definitions

tree cover to protect plants, etc

Ancestry of “suojapuusto”, step by step

suojapuusto traces back through two separate lines of ancestry.

via Finnish suoja

Step	Language	Word	Meaning
1	Finnish	suoja	shelter; protective covering; refuge
2	Proto-Finnic	sooja	shelter; protection; warm
3	Russian	со́я	jay {{i\|dialectal}}
4	Dutch	soja	soy
5	Japanese	そい	醤油 soy sauce
6	Japanese	醤油	soy sauce
7	Middle Chinese	醬油	—
8	Middle Chinese	醬	bean paste

via Finnish puusto

Step	Language	Word	Meaning
1	Finnish	puusto	The trees of an area collectively; the forest...
2	Russian	пусто́й	futile
3	Old East Slavic	поустъ	—
4	Proto-Slavic	pȗstъ	desolate; empty

Every word from Middle Chinese 醬 →Every word from Middle Chinese 醬油 →Every word from Japanese 醤油 →