Caitlyn is a moderately popular girls' name in United States, ranking #138 in 1996 with 2,334 recorded births. This places Caitlyn in the top 1% of ranked US girls' names for the year. Its actual usage is classified as Moderately Popular. The name reached its all-time peak in 1998 with 2,937 births ranking #115. In 1996, approximately 1 in every 751 girls born was named Caitlyn. FALLING Recent data shows the name is currently falling.