A name among the O'Byrnes, borne by Fiach MacHugh O'Byrne (1534–1597), chief of his name and lord of Ranelagh during the Elizabethan wars. Woulfe gives St Fiacha's day as 27 December.
Meanings follow Ó Corráin & Maguire's Irish Names and Woulfe;
pronunciations give the commonest Irish-English form.
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