O'Flannagain is a surname of Irish origin, often associated with the Gaelic name Ó Flannagáin. It typically means "descendant of Flannagan," with "Flann" meaning "red" or "ruddy." This name is common in Ireland and among those of Irish descent around the world. The O'Flannagain family has historical roots in various regions of Ireland, particularly in County Kerry and County Clare. Like many Irish surnames, it reflects the rich cultural heritage and lineage of the Irish people, often linked to specific clans or geographical areas.