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The spelling ""Conway"" has fallen out of modern usage in English and is considered old fashioned. Similar to how Y felinheli is no longer referred to as ""Port Dinorwic"". The name is de - Anglicised. Here is the welcome sign for Conwy. http://www.leanderarchitectural.co.uk/images/photos/full/SignsConwy.jpg As you can see the spelling ""Conway"" is not on the sign. Which means that ""Conwy"" is the spelling used officially for both Welsh and English.   "