Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
There are approximately 1,006 people named Colby in the UK. That makes it the 7,163rd most common surname overall. Out of every million people in the UK, approximately 16 are named Colby.
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Related and similar surnamesCoalby
The Colby 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.