Where does “Galapagos Islands” come from?

Galapagos Islands (English) comes from Spanish islas Galápagos, from Spanish galápago, from Undetermined calappacu.

Ancestry of “Galapagos Islands”, step by step

Step	Language	Word	Meaning
1	Spanish	islas Galápagos	—
2	Spanish	galápago	Any of several species of turtle; giant tortoise
3	Undetermined	calappacu	—

Galapagos Islands — Etymology, Origin & Word History | Etymology Explorer