Where does “南京豆” come from?

南京豆 (Japanese) comes from Japanese 南京, from Japanese 南, from Middle Chinese 南.

Ancestry of “南京豆”, step by step

南京豆 traces back through two separate lines of ancestry.

via Japanese 南京

StepLanguageWordMeaning
1Japanese南京pumpkin, squash; a southern capital
2Japanese南the south; a southerly, south wind; to go south
3Middle Chinese南—

via Japanese 豆

StepLanguageWordMeaning
1Japanese豆the pulses; a bean; a pea
Every word from Middle Chinese 南 →Every word from Japanese 南 →Every word from Japanese 南京 →