Type Word Usage Old Irish Meaning & History Old Irish word meaning "raven" [1]. Related ItemsDetails Given Name DescendantsFiacre(French) Fiachra(Irish) Fiachna, Fiachra, Fiachrae(Irish Mythology) Fiachna, Fiachrae(Old Irish) Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 415.