Declan is a moderately popular boys' name in England & Wales, ranking #371 in 2024 with 116 recorded births. The name reached its all-time peak in 1997 with 942 births ranking #69. Since 1996, the popularity has decreased by 82.9%. In 2024, approximately 1 in every 2,395 boys born was named Declan. STABLE Recent data shows the name is currently stable.