Etymology
* As an English and French surname, from heron.
* As an English surname, from Harome in Yorkshire, from Old English harum, dative plural of hær (“stone”)
* As an Irish surname, from O'Heron, from Ó hUidhrín (literally “descendant of Uidhrín”), from odhar (“swarthy”).
* As an Irish surname, from Ó hEaráin; see Haren.
* As an Irish surname, from Mac Giolla Chiaráin (literally “son of the servant of Ciarán”); see Kieran.