Katlyn is a distinctive girls' name in United States, ranking #505 in 2003 with 566 recorded births. The name reached its all-time peak in 1997 with 1,232 births ranking #242. Since 1996, the popularity has decreased by 52.3%. In 2003, approximately 1 in every 3,228 girls born was named Katlyn. FALLING Recent data shows the name is currently falling.