Katilyn is a distinctive girls' name in United States, ranking #3615 in 2008 with 45 recorded births. The name reached its all-time peak in 1998 with 101 births ranking #1614. Since 1996, the popularity has decreased by 32.8%. In 2008, approximately 1 in every 42,016 girls born was named Katilyn. STABLE Recent data shows the name is currently stable.