Katelynn is a moderately popular girls' name in United States, ranking #312 in 2010 with 1,028 recorded births. The name reached its all-time peak in 1998 with 1,457 births ranking #210. Since 1996, the popularity has decreased by 19.9%. In 2010, approximately 1 in every 1,729 girls born was named Katelynn. STABLE Recent data shows the name is currently stable.