Guest TF, well according to your theory, most Americans (over 200 million) would pronounce the name "Edinburgh" incorrectly!
But, as I've stated previously, there cannot be one universal pronunciation of a place name.
For, example, according to your theory, most Brits would be pronouncing New York and New Orleans incorrectly!
But, then again, according to the French, most Americans would be pronouncing the word "Orleans" incorrectly!