Watchful, alert, or pure
Kayse is a modern variant of Casey, which is derived from the Irish surname Ó Cathasaigh, meaning 'descendant of Cathasach'. The name Cathasach itself means 'watchful' or 'vigilant'. It is also occasionally used as a creative spelling of the name Kayce or as a diminutive of Katherine, meaning 'pure'.
Fewer than 5 boys were named Kayse in 2025.
US births per 5-year period, 1990–present (SSA data).
American photo editor and creative director
Protagonist and ranch hand · Yellowstone
