Caitlyn is a moderately popular girls' name in United States, ranking #165 in 2004 with 2,030 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 13.0%. In 2004, approximately 1 in every 904 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.