Caitlyn is a moderately popular girls' name in United States, ranking #256 in 2009 with 1,279 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 45.2%. In 2009, approximately 1 in every 1,436 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.