Meaning A unique name of Celtic origin, it is associated to Irish mythology being one of the children of Lir, who transformed into a Swan. Origin of Fiachra Celtic , Irish Popular Middle Names Pronunciation 🔊 Listen Fiachra Similar Names Larla Finn Finnegan Avan Tamunonemi Tristram Tristan Angus Swannee Svan Year by Year Popularity of Fiachra