Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
There are approximately 34,921 people named Sinclair in the UK. That makes it the 262nd most common surname overall. Out of every million people in the UK, approximately 553 are named Sinclair.
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Related and similar surnamesSinclaire
The Sinclair 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.