Katelynn is a moderately popular girls' name in United States, ranking #427 in 2012 with 737 recorded births. The name reached its all-time peak in 1998 with 1,457 births ranking #210. Since 1996, the popularity has decreased by 42.6%. In 2012, approximately 1 in every 2,389 girls born was named Katelynn. STABLE Recent data shows the name is currently stable.