I am in need of an answer to a trivia question. Does anybody know the name of the native tribe on Gilligan's Island?

More than one native group visited the island, but in episode 91 the people were known as the Kupaki (pronounced koo-pa-kai). Note Joey Green, in The Unofficial Gilligan's Island Handbook (1988), mistakenly reversed the first two vowels and called them "Kapuki" (p. 328).