Other branches of the clan: Flinn, O'Lynn, previously Ó'Loinn, Ó'Floinn, Ó'Flainn, O'Loinn, O'Lynn.
Lynn in Ulster.
Ó'Floinn was anciently sometimes written as Ua Fháibhall, and in Elizabethan times (mid-Fifteenth Century) O'Flywyn, O'Floyne, O'Floine. O'Flyne, O'Flyn, O'Fleine, O'Fling, Flyng.

This is the forty-first in the list of the most commonly used Irish surnames. It is derived from the Irish Gaelic personal name Flann meaning "ruddy", or "dull red" (of complexion). It originated in two main areas - County Cork and County Waterford in the Southern Province of Munster and adjacent areas in County Roscommon, County Leitrim and County Cavan on the borders of the Provinces of Connacht and Ulster. Two O'Flynn septs came from County Cork. One of these originated in the ancient territory of Corca Laoidhe in West Cork, in the area between Skibbereen and Baltimore, on either side of Clonakilty Bay. The name is also found North of Roscarberry in County Cork. The other sept were lords of the country between Ballyvourney and Blarney, which was named Muskerrylinn (from Irish Muscraidhe Ui Fhloinn). The pedigree of this branch of the family is in the Book of Leinster, which records Flann, son of Blathmac as the next heir in line for the chieftaincy. This Flann gave his name to the Muscraidhe Ui Fhloinn. These O'Flynns were constantly in dispute with the MacCarthys, who eventually forced them to move eastwards from this area.

Ballinlough is part of the ancestral home of the O'Flynns in Ireland and forms a stage of the Beara-Breifne Greenway which is based on the historic march of O'Sullivan Beara in 1603.

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