I know that Obi is japanese sash, but I thought that George Lucas may have used it also because OBI can stand for obliteration by incorporation.
but knowing George is not that smart, I will remove the obliteration by incorporation part of my post.
Obi (sash) is From Japan and Wan (Chinese abbreviation for the province of Anhui) is from China.
the name Anakin is a Surname like Wan.
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Number20 says
Maybe I'm wrong, but I thought that the novelization for ANH said that Vader and Obi-Wan fought and Vader fell into a volcano. I don't remember the radiation stuff from TESB.
it is in The second draft of The Empire Strikes Back screenplay and it seems at the time of making ESB (and maybe ROTJ) it was used.
(Lawrence Kasdan said that Vader was a Mutant. I think is this is in the Secret History of Star Wars or on www.starwarz.com).
The Duel between Anakin and Obi-wan always ended with Anakin falling into fire (a volcano or a molten pit).
But I think the falling into the nuclear reactor shaft was why Anakin turned to the darkside in the OOT backstory.
Both the falling into fire (a volcano or a molten pit) and falling into a nuclear reactor shaft seem to be true.
looking at the design of The unmasked vader from ESB and ROTJ, The OOT vader shows signs of both.
OOT vader with a burn on the back of his head which shows the falling into fire:
http://www.theforce.net/swtc/Pix/dvd/ep5/ldvader2.jpg
OOT vader face looks like somebody with radiation sickness which shows the falling into a nuclear reactor:
http://darthvader.blog.dada.net/archive/images/DarthVader.jpg
Also Lucas in the '04 DVDs changed the unmasked vader in ROTJ to match the lava burn-only Vader of EP III.
http://www.theforce.net/swtc/Pix/dvd/zs/rotj/unmasked2.jpg