Not a lot. Here's what I know.
Vanuatu is a South Pacific Island that gained it's independence in 1980 from British and French colonizers (it's a messed up system if you read about it).
Vanuatu's name is derived from the word vanua ("land" or "home"), which occurs in several Austronesian languages, and the word tu ("stand"). (Copied from Wikipedia)
From 1908 to 1980 (so the time this map was created) it was named New Hebrides after the Scottish islands. Those islands have a lot of myths that are on our maps including werewolves and will-o-the-wisps and kelpies. ( I hope it's not Kelpies cause I'll have a constenant fit)
Vanuatu's own mythology isn't represented on the map very well so it's hard to find something that ties to the island themselves, but then I said the same thing about Russian Sadko and I was wrong about that.