Pure
Caitlin is the Irish form of Cateline, which itself is the Old French version of Katherine. It shares the same root as the Greek name Aikaterine, which has long been associated with the Greek word 'katharos', meaning pure.
About 78 girls were named Caitlin in 2025.
US births per 5-year period, 1990–present (SSA data).
Irish author and wife of poet Dylan Thomas
English journalist and broadcaster
Bioengineer and superhero known as Killer Frost · The Flash
American actress and filmmaker
