Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
There are approximately 15,497 people named Gillespie in the UK. That makes it the 644th most common surname overall. Out of every million people in the UK, approximately 245 are named Gillespie.
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From name of parent
Related and similar surnamesGlaspy
The Gillespie 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.