Where does “soya” come from?

soya (Japanese) comes from Japanese 醤油, from Middle Chinese 醬油, from Middle Chinese 醬 — bean paste.

Ancestry of “soya”, step by step

Step	Language	Word	Meaning
1	Japanese	醤油	soy sauce
2	Middle Chinese	醬油	—
3	Middle Chinese	醬	bean paste

Words derived from “soya”

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