Alert or vigorous
Keysi is a modern phonetic spelling of Casey. It is derived from the Irish surname Ó Cathasaigh, meaning descendant of Cathasach. The root word 'cathasach' signifies someone who is watchful or vigilant.
Less common today
Keysi isn't in the latest US Top 1000. It last peaked at #4,619 in 2025.
US births per 5-year period, 1990–present (SSA data).
