Caitlyn is a moderately popular girls' name in United States, ranking #302 in 2010 with 1,071 recorded births. The name reached its all-time peak in 1998 with 2,937 births ranking #115. Since 1996, the popularity has decreased by 54.1%. In 2010, approximately 1 in every 1,660 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.