WOW! Nice find!!
Judging by the promixity of the islands from Japan too, I wouldn't be surprised if this book is where Takaya found inspiration for naming his character!
I wish there was some way of asking him...
As for the datafiles, they are certainly very useful as guidelines but when it comes to romanizing their own words into English, the Japanese can be very clumsy at the best of times.
(I have seen my name written as "Burendan" many many times now. lol)
One of the biggest screw-ups I can remember is the naming of one of the main characters in Fist of the North Star. For the longest time, overseas fans called the character "Souther" then a range of
toys came out saying his name was "Thouzer" (wtf?!) then the anime got licensed and it said "Sauza" (I think) So, yeah... helpful but probably not accurate much of the time.