Neé Síobhán Fíona
O'Brannon (O'Braonain / O'Broenain),
Derry, (Northern) Ireland (currently aka "The Six Counties").
Derry By Night
ancestral home, near Lough Erne and the Monastery (below)
Brennan surname is one of the most frequent surnames in Ireland and is to
be found throughout the country, though noticeably less common in Ulster.
It derives from the two Irish originals O'Braonain and MacBranain. The
MacBranain family were chiefs of a large territory in the east of the
present County Roscommon, and a large majority of the Brennan families of
North Connacht, counties Mayo, Sligo and Roscommon, descend from them.
O'Braonain originated in at least four distinct areas: Kilkenny, east
Galway, Westmeath and Kerry. Of these the most powerful were the
O'Braonain of Kilkenny, chiefs of Idough in the north of the county. After
they lost their land and status to the English, many of them became
notorious as leaders of bands of outlaws. A separate family, the
O'Brainain, are the ancestors of many of the Brennans of counties
Fermanagh and Monaghan, where the name was also anglicised as Brannan and
ancestors of the Brennan family are thought to have arrived in Ireland in
the 5th century B.C. and settled in northern Kilkenny shortly after the
time of Christ.
all descended from Cearbhall (pronounced Carroll), the most famous king of
Ossory. Through various political machinations, he ended up as king of the
Vikings in Ireland in 873 A.D. Cearbhall's son, Braonan, founded our
family in Idough. Not much is known about him, so it is not clear why his
descendants decided to adopt his name as the family's surname.