Katielynn is a distinctive girls' name in United States, ranking #17801 in 2015 with 5 recorded births. The name reached its all-time peak in 2006 with 20 births ranking #6478. Since 1996, the popularity has decreased by 37.5%. In 2015, approximately 1 in every 356,931 girls born was named Katielynn. STABLE Recent data shows the name is currently stable.