Where does “川蜘蛛” come from?

川蜘蛛 (Japanese) comes from Japanese 川, from Japanese 石川 — Ishi River (rivers in Japan).

Ancestry of “川蜘蛛”, step by step

川蜘蛛 traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japaneseriver, stream, brook
2Japanese石川Ishi River (rivers in Japan)

via Japanese 蜘蛛

StepLanguageWordMeaning
1Japanese蜘蛛spider; large spider
2Middle Chinese蜘蛛
Every word from Japanese 石川Every word from Japanese