Pure
A modern American phonetic 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
Katlynne isn't in the latest US Top 1000. It last peaked at #5,002 in 1994.
US births per 5-year period, 1990βpresent (SSA data).