The Scottish Gaelic patronymic of Fergusson is MacFhaerghuis which can also be translated as son of the angry. There is a tradition that attributes a common ancestry to the various distinct families bearing the name of Fergusson, however there is no evidence to support this and the heraldry of the chief's family is significantly different to that of other Fergusson families.
The Fergussons of Argyll claim descent from Fergus Mór, king of Dál Riata who came from Ireland across Argyll. Most shields of this family include a Boar's head which indicates a connection with the early Scots of Dál Riata.
There is evidence that links the Fergussons of Ayrshire and Dumfries with Fergus of Galloway, who was an important figure during the reigns of David I of Scotland and Malcolm IV of Scotland. Fergus of Galloway restored Whithorn church and also founded Dundrennan Abbey. He died in 1161 at Holyrood Abbey. The Earls of Carrick descend from Fergus of Galloway.
The Fergussons held lands at Kilkerran from probably the 12th century, although the first certain record is that of John Fergusson of Kilkerran in 1464. This John Fergusson may have been descended from John, son of Fergus who was a witness to a charter of Edward Bruce, which was signed in 1314 after the Battle of Bannockburn.
17th century and Civil War
The Clan Fergusson allied themselves with the Clan Kennedy chiefs, the Earls of Cassillis in their feud against the Kennedy Lairds of Bargany. The Fergussons were part of John Kennedy, 5th Earl of Cassilis's band in 1601 when a skirmish took place at Maybole where the Kennedy Laird of Bargany was killed.
Sir John Fergusson, who was born in about 1653 was a distinguished lawyer and a member of the Faculty of Advocates. In 1703 he was created a Baronet of Nova Scotia. In 1735 his son, James Fergusson became a judge of the Supreme Court and was given the title Lord Kilkerran. General Sir Charles Fergusson, the 7th Baronet served in the British Army for almost forty years.
- Clan Chief: Sir Charles Fergusson of Kilkerran, 9th BT, Chief of the Name and Arms of Fergusson.
- Clan Chief's Arms: Azure a buckle Argent between three boars' heads couped close Or.
- Fergusson (of Atholl)
- Fergusson of Balquhidder
- Ferguson Dress