Declan
[ˈdɛklən]Meaning
anglicized form of Irish Deaglán, of unknown meaning, likely from Old Irish dag "good"
Background Story
Declan is the anglicized form of the Irish name Deaglán, from Old Irish Declán, whose meaning is unknown though it likely begins with the Old Irish prefix dag, "good". In America the name received boosts in popularity from main characters in the films The Jackal (1997) and Leap Year (2010).
Temperament
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