Caitlyn is a moderately popular girls' name in United States, ranking #160 in 2003 with 2,080 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 10.9%. In 2003, approximately 1 in every 878 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.