Declan is a moderately popular boys' name in United States, ranking #131 in 2024 with 2,758 recorded births. The name reached its all-time peak in 2019 with 3,971 births ranking #95. Since 1996, the popularity has increased by 2,526.7%. In 2024, approximately 1 in every 622 boys born was named Declan. FALLING Recent data shows the name is currently falling.