Kacy

Meaning & origin

Kacy is a modern, feminine spelling variant of the Irish surname Casey. It first appeared on the U.S. naming scene in 1956, but saw its greatest popularity during the 1990s, peaking in 1990. Since 1991, its usage has been steadily declining; by 2025, the name ranked 8,362, with approximately 1 in every 133,939 newborn girls receiving it. The spelling likely gained traction alongside other trendy -ie and -y endings of the era, such as Kacie and Kacey. While not tied to any specific state or region in its current data, Kacy carries a friendly, approachable sound that fits well with other modern names. Though the name's meaning is unclear due to its respelled origin, its parent name Casey has a rich Irish heritage meaning 'vigilant.' Kacy remains a fresh alternative for parents seeking a name that combines traditional roots with a contemporary feel.

Kacy is a modern spelling variant of the name Casey, which itself derives from an Irish surname Ó Cathasaigh, meaning 'descendant of Cathasach,' where Cathasach means 'vigilant' or 'watchful.' The name Kacy emerged in the mid-20th century as a feminine given name, particularly in the United States, often chosen for its soft sound and similarity to other popular -ie ending names. Its usage has followed a pattern of rising in the 1990s before declining.