Katelyn is a moderately popular girls' name in United States, ranking #239 in 2015 with 1,385 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 74.5%. In 2015, approximately 1 in every 1,289 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.