Katelyn is a popular girls' name in United States, ranking #75 in 2007 with 4,258 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 21.5%. In 2007, approximately 1 in every 451 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.