Katelyn is a moderately popular girls' name in England & Wales, ranking #362 in 1999 with 89 recorded births. The name reached its all-time peak in 2004 with 263 births ranking #185. Since 1996, the popularity has increased by 323.8%. In 1999, approximately 1 in every 3,165 girls born was named Katelyn. RISING Recent data shows the name is currently rising.