Donand, Donander, Dunwale
In Geoffrey of Monmouth, a warrior in Arthur’s service who was the son of Papo. Geoffrey adopted his name from Welsh mythology.
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138
Roman de Brut | Wace, c. 1155
Brut | Layamon, late 12th century to mid-13th century