Meaning and history
Declán is the anglicized form of Irish Deaglán, Old Irish Declán, whose meaning is unknown but likely begins with the Old Irish prefix dag, meaning “good.” Saint Declan was a 5th-century missionary to the Déisi of Ireland and the founder of the monastery at Ardmore. In the United States, the name gained popularity from lead characters in the films The Jackal (1997) and Leap Year (2010).
20062006: 817 births, rank #366
2007: 923 births, rank #348
2008: 942 births, rank #347
2009: 1,046 births, rank #309
2010: 1,257 births, rank #274
20112011: 2,169 births, rank #176
2012: 2,781 births, rank #143
2013: 3,116 births, rank #121
2014: 3,321 births, rank #123
2015: 3,587 births, rank #112
20162016: 3,623 births, rank #109
2017: 3,470 births, rank #115
2018: 3,812 births, rank #101
2019: 3,971 births, rank #95
2020: 3,601 births, rank #101
20212021: 3,647 births, rank #106
2022: 3,345 births, rank #114
2023: 2,814 births, rank #132
2024: 2,765 births, rank #132
20252025: 2,570 births, rank #139
Declan moved from #132 to #139 for boys between 2024 and 2025. Its highest annual birth count came in 2019, with 3,971 births.