Pure
Caitlan is an English phonetic spelling of the Irish name Caitlin, which itself is the Gaelic form of Catherine. The name ultimately derives from the Greek name Aikaterine, which has long been associated with the Greek word 'katharos' meaning pure.
Less common today
Caitlan isn't in the latest US Top 1000. It last peaked at #1,686 in 1990.
US births per 5-year period, 1990–present (SSA data).
