Curly-haired or clever
A modern spelling variant of the Irish surname Cassidy. It is derived from the Gaelic 'O Caiside', which historically referred to a descendant of Caiside, a name meaning curly-headed or, in some interpretations, clever.
Fewer than 5 girls were named Cassidey in 2025.
US births per 5-year period, 1990–present (SSA data).
