From Ó Flannagáin, ‘descendant of Flannagán’ — several distinct septs, the best known chiefs of Tuath Ratha in County Fermanagh.
The Flanagan certificate.
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Gaelic Origin · Root name Flannagán, from flann, ‘red’
Flanagan anglicises Ó Flannagáin, built on the personal name Flannagán, itself rooted in flann, ‘red’ or ‘ruddy’. The name was carried by several distinct septs rather than one — the best documented were chiefs of Tuath Ratha in County Fermanagh, with further septs recorded in Roscommon and Leitrim.
A name that took root in more than one corner of Ireland at once, and held its ground in each.
Irish form: Ó Flannagáin
