Harry is just a different way of writing Henry, using something closer to the French pronunication.
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Theydon Bois, near Epping, with the "bois" pronounced "boys

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Mind, how about "Coemhghen" pronounced "Kevin"?

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Rather disappointingly Mousehole in Cornwall is pronounced Mowzel.

Equally regrettably, the Thai tourist island of Phuket is in fact meant to be pronounced with an aspirated P sound rather than an F.