Connolly is an Irish surname, the anglicized form of Gaelic Ó Conghaile meaning "descendant of Conghal", the latter meaning "valiant hound" made up from Irish con (the genitive singular of cú meaning "dog, hound") and gal (warlike ardor; valor, fury) via Proto-Celtic *galā (might, ability). It's also possible that it could be an anglicized form of Ó Coingheallach meaning "descendant of Coingheallach",… Continue reading Connolly
A History of Surnames 