An Irish surname meaning 'descendant of Braonán', often anglicized from Ó Braonáin. A family name with origins in medieval Ireland.
From Irish Gaelic 'Ó Braonáin', meaning 'descendant of Braonán'. The personal name 'Braonán' possibly derives from 'braon' meaning 'drop' or 'moisture', with diminutive suffix. The name spread through Irish diaspora, particularly to America.
The surname Brennan connects thousands of people worldwide to a single medieval Irish ancestor whose name meant something like 'little drop of water.' It's remarkable how one person's nickname became a family identity carried across oceans for centuries.
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