Caitlyn is a moderately popular girls' name in England & Wales, ranking #404 in 1997 with 78 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 129.4%. In 1997, approximately 1 in every 3,759 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.