 'Fergushill' as a surname is a sept of the Clan Fergusson; the area is either named after the family, i.e.Fergushill of that Ilk, or more likely, took the name of the area as their patronym, as with the Cunninghame clan.Robert de Fergushill de Eodem had an extensive estate here in 1417; 'de Eodem' refers to the patronym being the same name as the barony.