Caitlyn is a moderately popular girls' name in United States, ranking #378 in 2012 with 826 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 64.6%. In 2012, approximately 1 in every 2,132 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.