Duggan

Duggan is an Irish surname derived from the Gaelic 'Ó Dubhagáin', meaning 'descendant of Dubhagán'. The personal name Dubhagán is a diminutive of 'dubh', which means 'dark' or 'black', often referring to someone with dark hair or complexion. The 'án' suffix is a common diminutive in Irish, implying 'little dark one'. The surname originated in several distinct septs across Ireland, particularly in counties Cork, Galway, and Mayo. Over centuries, as surnames became more fixed, the 'Ó' prefix was often dropped or anglicized, leading to the modern form Duggan.

The name has a long history in Ireland, with records of various Duggan families holding land and positions of influence. Like many Irish surnames, it spread globally with Irish emigration, particularly during the 19th and 20th centuries. While primarily a surname, it has occasionally been adopted as a given name, especially in regions with strong Irish heritage, contributing to its unisex usage.