Kace is a modern American name, a respelling of Case or a short form of Casey, the Irish surname Ó Cathasaigh, which means "vigilant" or "watchful". It belongs to the group of punchy one-syllable K names like Kash and Kade. In the United States Kace rose from number 1594 in 2015 into the top 1000 in 2017, peaked at number 760 in 2019 and ranks number 1016 in 2025.