Strictly speaking, the name Wittenham Clumps refers to the wooded summits of these hills, which are themselves more properly referred to as the Sinodun Hills, the name Sinodun deriving from Celtic, Seno-Dunum, meaning 'Old Fort'. Alternatively, it has been suggested that the name is a scholarly creation, punning on the Latin 'sinus' (bosom). Other lesser-used and more colloquial names for the Clumps include the Berkshire Bubs (since the Clumps are in the historic county of Berkshire, though this area was transferred to Oxfordshire administratively in 1974) and Mother Dunch's Buttocks (after a local Lady of the Manor named Dunch).