Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
There are approximately 15,091 people named Callaghan in the UK. That makes it the 669th most common surname overall. Out of every million people in the UK, approximately 239 are named Callaghan.
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Related and similar surnamesCalahan
The Callaghan 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.