You would so, so totally love how the residents of Versailles, Indiana, US, pronounce their town's name. I'm very 'Merican and it makes me want to bang my head into to a wall.
A number of city names become shibboleths themselves - things like Spokane being pronounced "spow cane" instead of being spoken as spokan.
Of course if you go back far enough, even the original place names of many places are simply "bastardized" versions of the original. It's how Latin becomes Italian over time.
