Where does “ミズーリ” come from?

ミズーリ (Japanese) comes from English Missouri, from Miami wimihsoorita — the people who have dugout canoes.

Ancestry of “ミズーリ”, step by step

Step	Language	Word	Meaning
1	English	Missouri	—
2	Miami	wimihsoorita	the people who have dugout canoes

ミズーリ — Etymology, Origin & Word History | Etymology Explorer