Within the UK and Ireland, the surname Treharne most frequently occurs in Wales where it is carried by 1 in 5,585 people. The majority of those with the family name of Treharne are to be found living in/around Carmarthenshire (approx. 14% of all UK Treharne's), Bridgend County Borough and City and County of Swansea. The name can also be found in England with just 1 in every 100,683 people using it.
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