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Oh I see Paulb. It is wrong because you haven't heard it used and therefore it is outside (of) common usage. I stand corrected!
So far as I know there is no particular term to describe the...

Variant pronunciations or alternate pronunciations or acceptable pronunciations.

Variation is fine.

Version is incorrect.[/quote]

Variant can be a stand alone noun....
Why is version wrong...

All are acceptable in this context but as a Brit I would use variation. (I assume you are just talking about the different ways people choose to pronounce the same word - rather than about the area...