Britain (n.)youdaoicibaDictYouDict[Britain 词源字典]
c. 1300, Breteyne, from Old French Bretaigne, from Latin Britannia, earlier Brittania, from Brittani "the Britons" (see Briton). The Old English place-name Brytenlond meant "Wales." If there was a Celtic name for the island, it has not been recorded.[Britain etymology, Britain origin, 英语词源]