Katelyn is a moderately popular girls' name in United States, ranking #414 in 2017 with 768 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 85.8%. In 2017, approximately 1 in every 2,247 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.