Who are the Caroline Islands named for? Who first used the name?

The Caroline Islands are located in the Pacific Ocean and belong to Micronesia and Palau. They became a Spanish colony in the 16th century and the Spanish called them Las Carolinas in honour of King Charles II of Spain. The anglicised version of that name has stuck to the present day.

https://en.wikipedia.org/wiki/Caroline_Islands#Spanish_colony

Caroline Island in the Pacific Ocean is named to honour the daughter of Sir P. Stephens of the Admiralty. It was named by by Captain William Robert Broughton, who saw the island in 1795.

https://en.wikipedia.org/wiki/Caroline_Island

The Pacific archipelago called Caroline Islands was named Las Carolinas in honor of King Carlos II of Spain. Francisco de Lezcano named them in 1686.

https://en.wikipedia.org/wiki/Caroline_Islands