Caitlyn is a moderately popular girls' name in England & Wales, ranking #149 in 2002 with 296 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 770.6%. In 2002, approximately 1 in every 903 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.