Where does “マジュロ” come from?

マジュロ (Japanese) comes from English Majuro, from Marshallese Mājro.

Ancestry of “マジュロ”, step by step

Step	Language	Word	Meaning
1	English	Majuro	—
2	Marshallese	Mājro	—

マジュロ — Etymology, Origin & Word History | Etymology Explorer