Katelyn is a moderately popular girls' name in United States, ranking #173 in 2014 with 1,923 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 64.5%. In 2014, approximately 1 in every 929 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.