I must be out of my mind for replying to this...

Just, a reality check, here.  You're talking about something translated
from Chinese to Japanese to English, and criticizing someone for incorrect
spelling.  If this is your goal in life... man, you need better goals.

As for me... I'll be honest: Whenever I have seen the Chinese name 'shan'
translated into English, it has been spelled 'Xian' - and I don't mean
fanfic, either.  Now, from Chinese to Japanese to English would likely be
different, as Japanese doesn't have an 'X'.  So... they translate it in
kana like it sounds: "Shan".  Now, I'm no expert in translation from
Chinese to anything else; I don't know the methods involved.  But, I do
think some leeway needs to be given in a case like this.

-- Nick