Katilyn is a distinctive girls' name in United States, ranking #4058 in 2009 with 38 recorded births. The name reached its all-time peak in 1998 with 101 births ranking #1614. Since 1996, the popularity has decreased by 43.3%. In 2009, approximately 1 in every 48,339 girls born was named Katilyn. STABLE Recent data shows the name is currently stable.