Curly-haired; clever
A modern variant of the Irish surname Cassidy, derived from the Gaelic 'O Caiside'. It historically refers to descendants of Caiside, a name meaning 'curly-headed'. In modern usage, it is often associated with the word 'clever' or 'ingenious' due to the family's historical role as physicians and scholars.
Fewer than 5 girls were named Cassity in 2025.
US births per 5-year period, 1990–present (SSA data).
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