Toponymy
Several explanations for the name "Mendip" have been suggested. Its earliest known form is Mendepe in 1185. One suggestion is that it is derived from the medieval term "Myne-deepes". However, others suggest it derives from Celtic monith, meaning mountain or hill, with an uncertain second element, perhaps Old English yppe in the sense of upland or plateau.
An alternative explanation is that the name is cognate with Mened (Welsh mynydd), a Brythonic term for upland moorland. The suffix may be a contraction of the Old English hop, meaning a valley. Possible further meanings have been identified. The first is 'the stone pit' from the Celtic meyn and dyppa in reference to the collapsed cave systems of Cheddar. The second is "Mighty and Awesome" from the Old English moen and deop.
Yet another explanation is that Mendip is cognate with the Basque word mendi meaning mountain. This would support the theory of a Basque-like language in use in the British isles before the emergence of the Celtic languages. This is supported by DNA evidence that shows genetic links between the British Celtic people and the Basques.
Read more about this topic: Mendip Hills