Caitlyn is a moderately popular girls' name in England & Wales, ranking #169 in 2000 with 259 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 661.8%. In 2000, approximately 1 in every 1,055 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.