Kaycee is a feminine variant of the name Casey, which is of Irish origin. The name Casey itself is derived from the Gaelic surname Ó Cathasaigh, meaning 'descendant of Cathasach', with Cathasach being a personal name meaning 'vigilant' or 'watchful'. Kaycee, as a given name, carries the same connotations of vigilance and watchfulness, embodying qualities of alertness and awareness.