Cailean is a distinctive boys' name in England & Wales, ranking #4275 in 2025 with 4 recorded births. The name reached its all-time peak in 2010 with 7 births ranking #2629. Since 1996, the popularity has increased by 33.3%. In 2025, approximately 1 in every 67,984 boys born was named Cailean. STABLE Recent data shows the name is currently stable.