Vigorous, alert, or a modern phonetic variant of Casey
Keisy is a modern phonetic spelling of the Irish name Casey, which is derived from the Gaelic surname Ó Cathasaigh. It traditionally means 'vigorous' or 'watchful.' In recent years, this specific spelling has gained some popularity in Spanish-speaking communities as a creative adaptation of the English sound.
About 36 girls were named Keisy in 2025.
US births per 5-year period, 1990–present (SSA data).
