Caitlyn is a moderately popular girls' name in United States, ranking #115 in 1998 with 2,937 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has increased by 25.8%. In 1998, approximately 1 in every 602 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.