Pure
Caitlain is a rare phonetic spelling variant of the Irish name Caitlin, which itself is the Irish form of Catherine. The name ultimately derives from the Greek name Aikaterine, which has been associated with the Greek word katharos, meaning pure.
Fewer than 5 girls were named Caitlain in 2025.
US births per 5-year period, 1990–present (SSA data).
