Where does “Bishamonten” come from?

Bishamonten (English) comes from Japanese 毘沙門天, from Sanskrit वैश्रवण.

Ancestry of “Bishamonten”, step by step

Step	Language	Word	Meaning
1	Japanese	毘沙門天	—
2	Sanskrit	वैश्रवण	—

Bishamonten — Etymology, Origin & Word History | Etymology Explorer