Within the UK and Ireland, the surname Mainwaring most frequently occurs in Wales where it is carried by 1 in every 2,763 people. The majority of those with the family name of Mainwaring are to be found living in/around City and County of Swansea (approx. 10% of all UK Mainwaring's), Neath Port Talbot County Borough and Carmarthenshire. The name can also be found in England with 1 in 31,239 people using it.
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