Caitlyn is a moderately popular girls' name in England & Wales, ranking #159 in 2007 with 344 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 911.8%. In 2007, approximately 1 in every 890 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.