The Crest
The Donnelly arms are not a catalogue shield with a surname typed onto it. Every charge on this coat of arms is a specific claim about who the family was and who they stood beside.
The Red Hand of Ulster
At the centre, a right hand severed at the wrist, in red — the emblem of the uí Néill, the kindred that ruled the north of Ireland. It is older than heraldry itself, appearing on uí Néill battle standards centuries before the Normans brought formal coats of arms to Ireland. The Donnellys carry it by descent.
Two lions, combatant
Two red lions rear on their hind legs and face each other across the hand. In heraldry a lion in this posture is rampant; two facing off are combatant. Their arrangement is not decorative — the O'Donnellys were hereditary marshals to the O'Neills of Tyrone, the military office of the ruling house held by one family and passed down. Two armed guardians flanking the king's emblem is a job description.
The salmon
Beneath a wavy line — heraldry's way of drawing water — a salmon swims in the base of the shield. In Irish legend the Salmon of Knowledge carried all the wisdom in the world in its flesh. Battle above, learning beneath.
The three stars that aren't there
Set the Donnelly arms beside the O'Neill arms and they are nearly the same shield: the same Red Hand, the same lions, the same salmon. The difference is three red stars, which O'Neill has and Donnelly does not. That near-identity is the point — in Gaelic heraldry, arms echoing a ruling house declare kinship with it. The Donnelly shield is a statement of belonging to the Cenél nEógain.
Ó Donnghaile
The name is the anglicised form of Ó Donnghaile — descendant of Donnghal, from donn (brown) and gal (valour). The sept held its seat at Ballydonnelly, Baile Uí Dhonnghaile, in County Tyrone, and appears in the Annals of the Four Masters under 1531.