Caitlyn is a moderately popular girls' name in England & Wales, ranking #145 in 2003 with 336 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 888.2%. In 2003, approximately 1 in every 829 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.