Derived from Caston or Casten, meaning from the town of Chasten
Kastyn is a modern American invention, likely a phonetic variation of the English surname Caston or a creative blend of names like Kason and Austin. As a surname derivative, it historically points to various English localities. It follows the contemporary trend of replacing vowels with 'y' to create a unique, gender-neutral identity.
Fewer than 5 boys were named Kastyn in 2025.
US births per 5-year period, 1990–present (SSA data).
