O'Brannan family genealogy
Of Ulster
Arms: Ar. a lion ramp. az. in chief two dexter hands couped at the wrist apaumée gu.
OLIOLL, a brother of Cearnach who is No. 98 on the "Breslin" pedigree, was the ancestor of O'Brannain, of Ulster; anglicised O'Brannan, and Brannan.
98. Olioll: son of Fergus.
99. Connor: his son.
100. Brannan ("bran:" Irish, a mountain torrent): his son; a quo O'Brannain.