Within the UK and Ireland, the surname Garthwaite most frequently occurs in England where it is carried by 1 in 59,175 people. The majority of those with the family name of Garthwaite are to be found living in/around Durham (approx. 20% of all UK Garthwaite's), West Yorkshire and North Yorkshire. The name can also be found in Scotland with just 1 in every 150,833 people using it.
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