Caitlyn is a moderately popular girls' name in United States, ranking #406 in 2013 with 754 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 67.7%. In 2013, approximately 1 in every 2,327 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.