Where does “soya bean” come from?

soya bean (English) comes from English bean, from Middle English bene, from Old English bēn, from Proto-Germanic banjō, from Proto-Indo-European gʷʰon-yeh₂, from Proto-Indo-European gʷʰen-, from Proto-Indo-European bʰon-.

Ancestry of “soya bean”, step by step

soya bean traces back through two separate lines of ancestry.

via English bean

StepLanguageWordMeaning
1EnglishbeanAny plant of several genera of the taxonomic...
2Middle Englishbenegracious, generous, pleasant; neighbourly help,...
3Old Englishbēnprayer, request; prayer, request, petition,...
4Proto-Germanicbanjōwound
5Proto-Indo-Europeangʷʰon-yeh₂
6Proto-Indo-Europeangʷʰen-to strike, slay, kill
7Proto-Indo-Europeanbʰon-

via English soya

StepLanguageWordMeaning
1EnglishsoyaAlternative form of soy
2Dutchsojasoy
3Japaneseそい醤油 soy sauce
4Japanese醤油soy sauce
5Middle Chinese醬油
6Middle Chinesebean paste
Every word from Proto-Indo-European bʰon-
soya bean — Etymology, Origin & Word History | Etymology Explorer