Caitlin is a highly popular girls' name in England & Wales, ranking #21 in 2001 with 2,228 recorded births. The name reached its all-time peak in 2003 with 2,277 births ranking #22. Since 1996, the popularity has increased by 145.9%. In 2001, approximately 1 in every 120 girls born was named Caitlin. FALLING Recent data shows the name is currently falling.