Kathlyn is a distinctive girls' name in United States, ranking #3348 in 1999 with 38 recorded births. The name reached its all-time peak in 2024 with 63 births ranking #2725. Since 1996, the popularity has decreased by 11.6%. In 1999, approximately 1 in every 46,678 girls born was named Kathlyn. RISING Recent data shows the name is currently rising.