Caitlyn is a moderately popular girls' name in England & Wales, ranking #248 in 1998 with 160 recorded births. This places Caitlyn in the top 5% of ranked UK girls' names for the year. Its actual usage is classified as Moderately Popular. The name reached its all-time peak in 2005 with 353 births ranking #144. Since 1996, the popularity has increased by 370.6%. In 1998, approximately 1 in every 1,807 girls born was named Caitlyn. STABLE Recent data shows the name is currently stable.