Karma
That Wyndmomhahdman thing just takes the piss. If it's pronounced Windham, then spell it like that FFS. Whoever made that up was just being anal for no reason!
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Are we going to row all night?
You know full well that place names have long and complicated histories. For example, when Edward I's wife died he was so grief-stricken he had her body carried in state across England back to London for burial. At each overnight stop he decreed a large cross be built in her memory. The Eleanor Crosses have given us Waltham Cross and Charing Cross. Charing from chere rein" = dear queen. OK...I'm arguing your point here
but historically we have Mainwaring pronounced Mannering and Bevoir pronounced Beaver (a LOT more scope for comedy there quite clearly...) It's the way English has evolved and continues to evolve. If it was that easy to speak most people on the planet would have a grasp of it. We can't make it THAT easy...