Caitlyn is a moderately popular girls' name in United States, ranking #182 in 2005 with 1,898 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 18.7%. In 2005, approximately 1 in every 973 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.