Caitlyn is a moderately popular girls' name in England & Wales, ranking #208 in 1999 with 202 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 494.1%. In 1999, approximately 1 in every 1,395 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.