Katelyn is a popular girls' name in United States, ranking #58 in 1998 with 5,367 recorded births. This places Katelyn in the top 1% of ranked US girls' names for the year. Its actual usage is classified as Popular. The name reached its all-time peak in 2000 with 5,502 births ranking #54. In 1998, approximately 1 in every 329 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.