Deagan is a unique, two-syllable given name of Irish origin. Pronounced "DEE-ah-gun," it is derived from the Irish surname Ó Dáibhín, which means "descendant of Daithí." Daithí itself is a diminutive of the Irish name Donnchadh, meaning "brown-haired" or "dark warrior." Therefore, Deagan can be loosely translated to mean "son of the dark warrior." While it has not traditionally been among the most popular names in Ireland or elsewhere, its uncommon nature makes it stand out and appeals to those seeking a distinctive name for their child.
"Deagen saw a peak in popularity between 2006 and 2008 with 13 births each year. However, it seems the name's usage has since decreased, with only 7 or fewer births per year from 2010 onwards. Overall, there were 80 babies named Deagen over this period."