[ThinkingGuy]

In the (US English) versions that were read to me as a child, I seem to recall it being rendered "King of the Pygmies."

[SamBam]

My Penguin version (1997) has "King of the Cannibals." Not much better -- probably worse, in fact, since they aren't even depicted as cannibals, so the name isn't in any way necessary.

But I guess "King of the Islanders" would be boring.