Within the UK and Ireland, the surname Blanche most frequently occurs in Wales where it is carried by 1 in 27,535 people. The majority of those with the family name of Blanche are to be found living in/around Caerphilly County Borough (approx. 6% of all UK Blanche's), Bridgend County Borough and Blaenau Gwent County Borough. The name can also be found in Ireland with 1 in 37,734 people using it, Scotland with 1 in 84,844, and England with 1 in 114,949.
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