Etymology
* As an Irish surname, from Ó Breacáin (“descendant of Breacán”), from Breacán, a name diminutive of breac (“spotted”)
* As an English surname, from Middle English bracken (“fern”)
* As an English habitational surname, from Bracon Ash in Norfolk, Bracken in Yorkshire
* As a German surname, from Middle Low German braak (“fallow”)
Also compare Brackeen.