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In page Devon:

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The name Devon derives from the name of the Brythons who inhabited the southwestern peninsula of Britain at the time of the Roman conquest of Britain known as the Dumnonii, thought to mean 'deep valley dwellers' from Proto-Celtic *dubnos 'deep'. In the Brittonic languages, Devon is known as Welsh: Dyfnaint, Breton: Devnent and Cornish: Dewnens, each meaning 'deep valleys'. (For an account of Celtic Dumnonia, see the separate article.) Among the most common Devon placenames is -combe which derives from Brittonic cwm meaning 'valley' usually prefixed by the name of the possessor.[citation needed]