Watchful, alert, or thorny
Kacy is a phonetic spelling variant of Casey, which is derived from the Irish surname Ó Cathasaigh, meaning 'watchful' or 'vigilant'. It is also occasionally linked to the initials K.C. or as a diminutive of the name Acacia, which refers to a thorny tree. In the United States, this specific spelling peaked in popularity during the late 20th century.
About 12 girls were named Kacy in 2025.
US births per 5-year period, 1990–present (SSA data).
Gymnast and professional wrestler, first woman to complete the American Ninja Warrior course
American singer-songwriter and former model
Celebrity fitness trainer and life coach
The same feel as Kacy — far less common.
Hidden gems that stand out.
