First found in Galloway, Ireland where St. Fergus (Fergustian) (circa 730 AD) was an Irish bishop, who went to Scotland as a missionary. He settled near Strageath and founded three churches in Strogeth and two in Caithness. It is possible that he was the Fergustus Pictus who went to Rome in 721 AD. According to Irish lore, a family of this name descend from Fergus, Prince of Galloway (d. 1161), who is said to have married a daughter of Henry I of England.

Significant portions of the populations of both the United States and Canada are still made up of the ancestors of Dalriadan families. Some of those in Canada originally settled the United States, but went north as United Empire Loyalists in the American War of Independence. The late 19th and early 20th centuries saw the ancestors of many Scots on both sides of the border begin to recover their collective national heritage through clan societies and highland games. Some of the first North American settlers carried this name or one of its variants: Owen Fergus, who settled in Boston in 1739; James Fergus, who arrived in North Carolina in 1740; another James Fergus, who settled in New York in 1774.

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