lucy24 - 11:25 pm on Nov 26, 2012 (gmt 0)
I was thinking Laputa, but I may have my sources garbled.
South Pacific would normally mean that its name is whatever religious holiday it was discovered* on. So St. someone-you've-never-heard-of. But I guess not, if it never really existed.
* "... I naturally passed through a great deal of new country, and discovered, as we white men say when we are pointed out some geographical feature by an Indian who has been familiar with it since childhood ..."
--author's introduction to The Barren Ground of Northern Canada (1917).