Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
There are approximately 11,448 people named Clay in the UK. That makes it the 910th most common surname overall. Out of every million people in the UK, approximately 181 are named Clay.
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Related and similar surnamesClas
The Clay surname in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
Patronymica Britannica (1860)
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.