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English: habitational name from any of the many places throughout England named Bradley from Old English brād ‘broad’ + lēah ‘woodland clearing’. Scottish: habitational name from Braidlie in Roxburghshire. Irish (Ulster): adopted as an English equivalent of Gaelic Ó Brolcháin ‘descendant of Brolacháin’ a diminutive of the personal name Brólach compare Brawley . This was a learned family.
Source: Dictionary of American Family Names 2nd edition, 2022