Kamber
Son of Brutus, first king of Britain, and brother of Albanact and Locrine (Locrinus).
According to Geoffrey of Monmouth, he gave his name to Cambria, or Wales.
Sources
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138
Roman de Brut | Wace, c. 1155
Palamedes | c. 1240