Caitlyn is a moderately popular girls' name in England & Wales, ranking #323 in 2015 with 145 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 326.5%. In 2015, approximately 1 in every 2,124 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.