Caitlyn is a distinctive girls' name in United States, ranking #598 in 2015 with 494 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 78.8%. In 2015, approximately 1 in every 3,613 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.