Caitlyn is a moderately popular girls' name in England & Wales, ranking #158 in 2001 with 281 recorded births. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 726.5%. In 2001, approximately 1 in every 954 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.