From Ó Caiside, likely ‘curly-haired’ — hereditary physicians to the Maguire chiefs of Fermanagh.
The Cassidy certificate.
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Gaelic Origin · Root meaning ‘curly-haired’
Cassidy comes from Ó Caiside, possibly describing an ancestor's curly hair. The family served for generations as hereditary physicians to the Maguire chiefs of Fermanagh — a professional medical line, trained and practising within the one family across centuries.
A name that inherited a medical education instead of a sword — proof that Gaelic Ireland valued a good doctor as much as a good chief.
Irish form: Ó Caiside
