Katelyn is a popular girls' name in United States, ranking #90 in 2009 with 3,571 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 34.1%. In 2009, approximately 1 in every 514 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.