Caitlin is a highly popular girls' name in England & Wales, ranking #25 in 1999 with 2,072 recorded births. The name reached its all-time peak in 2003 with 2,277 births ranking #22. Since 1996, the popularity has increased by 128.7%. In 1999, approximately 1 in every 136 girls born was named Caitlin. FALLING Recent data shows the name is currently falling.