Caitlyn is a moderately popular girls' name in England & Wales, ranking #166 in 2006 with 325 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 855.9%. In 2006, approximately 1 in every 921 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.