Brennan Family History
Brennan Name Meaning
Irish:: Anglicized form of Gaelic Ó Branáin or Mac Branáin ‘descendant (or son) of Branán’ a personal name meaning ‘little raven’. Anglicized form of Ó Braonáin ‘descendant of Braonán’ a personal name based on a diminutive of braon ‘drop’. Compare Aubry
Source: Dictionary of American Family Names 2nd edition, 2022