The story is people from one area pronounced it one way, and it was used to identify them, or something. As in, the word shibboleth, Hebrew for... I've literally no idea, but that's the reason this word means something like "tacitly recognised in-group identifier" nowadays.
I want to embellish the story with murder and stuff but I'd be winging it, I can't remember the details properly.
Edit: it means grain, apparently, or more specifically the "ear" of the plant in the context of grains. But that's not important now.
Oh... Then the pronunciation guide from my search engine is saying it the wrong way. I guess so many people have pronounced it incorrectly that now it's kinda acceptable. It's "foyer" all over again. Say it the right way and people just think you're pretentious.