Katlyn is a distinctive girls' name in United States, ranking #619 in 2005 with 457 recorded births. The name reached its all-time peak in 1997 with 1,232 births ranking #242. Since 1996, the popularity has decreased by 61.5%. In 2005, approximately 1 in every 4,043 girls born was named Katlyn. FALLING Recent data shows the name is currently falling.