Pure
Kaityln is a modern spelling variant of the name Caitlin, which is the Irish form of Catherine. The name ultimately derives from the Greek name Aikaterine, which is widely associated with the Greek word 'katharos', meaning pure. This specific spelling is extremely rare and likely originated as a creative variation or a typographical transposition of the more common Kaitlyn.
Less common today
Kaityln isn't in the latest US Top 1000. It last peaked at #8,635 in 1992.
US births per 5-year period, 1990βpresent (SSA data).