Kathlyn is a distinctive girls' name in United States, ranking #2761 in 2000 with 53 recorded births. The name reached its all-time peak in 2024 with 63 births ranking #2725. Since 1996, the popularity has increased by 23.3%. In 2000, approximately 1 in every 34,264 girls born was named Kathlyn. RISING Recent data shows the name is currently rising.