Alert, watchful, or from the place of the oak
Cassey is primarily a modern variant of the Irish surname Casey, derived from 'cathasach' meaning vigilant. It is also occasionally used as a diminutive for Cassandra or Catherine. While rare today, it shares the friendly, approachable sound of other mid-century favorites.
Fewer than 5 girls were named Cassey in 2025.
US births per 5-year period, 1990–present (SSA data).
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