Pure
Katelan is a modern phonetic spelling of Caitlin, the Irish form of Catherine. It ultimately derives from the Greek name Aikaterine, which is widely associated with the concept of purity.
Less common today
Katelan isn't in the latest US Top 1000. It last peaked at #4,370 in 1990.
US births per 5-year period, 1990βpresent (SSA data).