Derived from Casey, meaning watchful or vigilant
Kacyn is a modern creative spelling of the Irish surname Casey. It likely stems from the Gaelic name Cathasaigh, which translates to watchful or vigilant. This specific spelling variation is a 21st-century American invention, following the trend of replacing vowels with 'y'.
About 22 boys were named Kacyn in 2025.
US births per 5-year period, 1990–present (SSA data).
