Origin of the Name Callaghan
family history was found in the allfamilycrests.com archives. The names Callaghan, Callahan and O'Callaghan in Irish are derived from the Gaelic O'Ceallachain sept which in turn originated with Ceallachan, who was King of Munster in the year 952, and who was once head of the sept.
A sept or clan is a collective term describing a group of persons whose immediate ancestors bore a common surname and inhabited the same territory. Irish septs and clans that are related often belong to even larger groups, sometimes called tribes.
They were dispossessed of their original territory in the Barony of Kinelea, County Cork, after the Anglo-Norman invasion of 1172, after which they acquired a large area of north Cork near Mallow and retained it until again dispossessed by the Cromwellian Regime. The leading family of the sept then migrated to County Clare, where the village of O'Callaghan's Mills bears their name. Other members of the sept were not transplanted and today the area in which the O'Callaghans are chiefly found is still County Cork and the surrounding Counties.
The Callaghan coat of arms came into existence centuries ago. The process of creating coats of arms (also often called family crests) began in the eleventh century although a form of Proto-Heraldry may have existed in some countries prior to this. The new art of Heraldry made it possible for families and even individual family members to have their very own coat of arms, including all Callaghan descendants.