Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
CASSIDY
There are approximately 15,529 people named Cassidy in the UK. That makes it the 642nd most common surname overall. Out of every million people in the UK, approximately 246 are named Cassidy.
Region of origin
British Isles
Country of origin
Ireland
Language of origin
Gaelic
Religion of origin
Christian
Classification
Celtic
Related and similar surnames
CasidayCasida
Casady
Casidy
Caasidy
Casiddy
Casidey
Casidyu
Casidyy
Casidys
Casidi
Casid
Casidie
Caside
Casitdy
Casisidy
Casidis
Casidio
Casidia
Casidty
Caiside
Cashidy
Casdy
The Cassidy surname in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Gaelic.) From casaideach, apt to complain or accuse. Casadow, in the Cor. Br., signifies an offender.