Caitlyn is a moderately popular girls' name in United States, ranking #200 in 2006 with 1,755 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 24.8%. In 2006, approximately 1 in every 1,083 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.