I'm still not sure what you were after when you asked for an "annotation (or perhaps a new page) regarding the origin of Sion", but I guess you were wanting a link to the word "Zion". I assume that the Annemasse hill (like many others) was named after the Jerusalem hill, but since I have no evidence of that I just added a sentence about the origin of the name and the fact that the use of "S" rather than "Z" has no special significance - it's just the normal way of spelling Zion in French, as emphasised in earlier organisations such as the Congregation de Notre-Dame de Sion.