Within the UK and Ireland, the surname Sydenham most frequently occurs in Wales where it is carried by 1 in 32,031 people. The majority of those with the family name of Sydenham are to be found living in/around City and County of Cardiff (approx. 3% of all UK Sydenham's), Vale of Glamorgan County Borough and Neath Port Talbot County Borough. The name can also be found in England with 1 in 82,688 people using it.
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