Derived from Casey, meaning watchful or vigilant.
Caysin is a modern American invention, likely created by blending the traditional Irish surname Casey with the popular '-in' or '-en' suffix. It shares the etymological roots of Casey, which comes from the Gaelic 'cathasaigh', denoting one who is alert or brave.
Less common today
Caysin isn't in the latest US Top 1000. It last peaked at #7,454 in 2015.
US births per 5-year period, 1990–present (SSA data).
