Katelynn is a moderately popular girls' name in United States, ranking #294 in 2005 with 1,113 recorded births. The name reached its all-time peak in 1998 with 1,457 births ranking #210. Since 1996, the popularity has decreased by 13.3%. In 2005, approximately 1 in every 1,660 girls born was named Katelynn. STABLE Recent data shows the name is currently stable.