Clan Fergusson is a Scottish chiefly clan.
Known as the 'Sons of Fergus' this clan spread across Scotland from Ross-Shire in the north to Dumfriesshire in the south-west. <ref>George Way of Plean and Romilly Squire, Scottish Clan and Family Encyclopedia, 136</ref> The Scottish Gaelic patronymic of Fergusson is MacFhaerghuis which can also be translated as son of the angry. <ref>Plean, Squire, Encyclopedia, 136</ref> 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. <ref>Plean, Squire, Encyclopedia, 136</ref> According to Dorward, the personal name 'Fergus' means 'super-choice' and it gained popularity in Scotland and Ireland. Many different families therefore adopted the name Fergusson. <ref>David Doward, Collins Dictionary of Scottish Surnames, 93</ref>