Pious or pure; possibly a variant of Caston
Castin is a rare surname-turned-given name. It likely derives from the French 'Saint-Cast', or may be a variant of the English surname Caston, referring to a town in Norfolk. In some contexts, it is associated with the Latin 'castus', meaning pure or chaste.
About 5 boys were named Castin in 2025.
US births per 5-year period, 1990–present (SSA data).
French military officer and colonial administrator in Acadia
