Within the UK and Ireland, the surname Mostyn most frequently occurs in Wales where it is carried by 1 in 28,536 people. The majority of those with the family name of Mostyn are to be found living in/around Wrexham County Borough (approx. 4% of all UK Mostyn's), Denbighshire and Carmarthenshire. The name can also be found in England with just 1 in every 106,426 people using it, and Scotland with 1 in 132,439.
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