Caitlyn is a moderately popular girls' name in England & Wales, ranking #144 in 2005 with 353 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 938.2%. In 2005, approximately 1 in every 817 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.