Pure
Katelen is a modern phonetic variant of Caitlin, which is the Irish form of Katherine. It ultimately derives from the Greek name Aikaterine, which has long been associated with the concept of purity.
Less common today
Katelen isn't in the latest US Top 1000. It last peaked at #6,840 in 1990.
US births per 5-year period, 1990βpresent (SSA data).