Pure or alert
Casyn is a modern American invention, likely created as a phonetic variation of Cason or a blend of Casey and Mason. While its roots are obscure, it is often associated with the Greek name Katherine, meaning pure, or the Irish surname Casey, meaning vigilant or alert.
Less common today
Casyn isn't in the latest US Top 1000. It last peaked at #3,257 in 2020.
US births per 5-year period, 1990–present (SSA data).
