Supposedly titular of an island west of the Outer Hebrides, never existed. The name is a corruption of ‘Skildir’, a Norse word meaning ‘shields’, which was given to a group of these islands to the west of Harris. Later it was transferred to the island Hirta, which by the late 16th century, through orthographic and cartographic error, became known as ‘St Kilda’.
A. B. Taylor, ‘The name St Kilda’, Scottish Studies, xiii (1969), 145–58.