Katelyn is a moderately popular girls' name in United States, ranking #143 in 2013 with 2,148 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 60.4%. In 2013, approximately 1 in every 817 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.