Caitlyn is a moderately popular girls' name in England & Wales, ranking #296 in 2014 with 159 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 367.6%. In 2014, approximately 1 in every 1,929 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.