Katelyn is a popular girls' name in United States, ranking #53 in 2002 with 5,267 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 2002, approximately 1 in every 341 girls born was named Katelyn. FALLING Recent data shows the name is currently falling.