Katelyn is a moderately popular girls' name in United States, ranking #106 in 2011 with 2,842 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 47.6%. In 2011, approximately 1 in every 619 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.