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.
Less common today
Cassidey isn't in the latest US Top 1000. It last peaked at #9,197 in 2001.
US births per 5-year period, 1990–present (SSA data).
