Kathlyn is a distinctive girls' name in United States, ranking #9918 in 2021 with 10 recorded births. The name reached its all-time peak in 2024 with 63 births ranking #2725. Since 1996, the popularity has decreased by 76.7%. In 2021, approximately 1 in every 163,971 girls born was named Kathlyn. RISING Recent data shows the name is currently rising.