Watchful or vigilant
Casy is a variant of the Irish surname Casey, derived from the Gaelic 'O Cathasaigh'. It historically denotes a descendant of Cathasach, a personal name meaning 'vigilant' or 'watchful'. While rare as a first name, it carries a sense of alertness and heritage.
Fewer than 5 boys were named Casy in 2025.
The former preacher and labor activist · The Grapes of Wrath
US births per 5-year period, 1990–present (SSA data).
