Caitlyn is a moderately popular girls' name in England & Wales, ranking #174 in 2008 with 306 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 800.0%. In 2008, approximately 1 in every 1,032 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.