Katelynn is a moderately popular girls' name in United States, ranking #210 in 1998 with 1,457 recorded births. The name reached its all-time peak in 1998 with 1,457 births ranking #210. Since 1996, the popularity has increased by 13.5%. In 1998, approximately 1 in every 1,213 girls born was named Katelynn. STABLE Recent data shows the name is currently stable.