Katelyn is a moderately popular girls' name in United States, ranking #376 in 2016 with 870 recorded births. The name reached its all-time peak in 2000 with 5,502 births ranking #54. Since 1996, the popularity has decreased by 84.0%. In 2016, approximately 1 in every 2,036 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.