Pure
A modern Americanized spelling of Caitlin, which is the Irish form of Catherine. It ultimately derives from the Greek name Aikaterine, which has long been associated with the concept of purity.
Less common today
Caitlynne isn't in the latest US Top 1000. It last peaked at #4,460 in 1998.
US births per 5-year period, 1990βpresent (SSA data).