ClarenceyoudaoicibaDictYouDict[Clarence 词源字典]
surname, from Medieval Latin Clarencia, name of dukedom created 1362 for Lionel, third son of Edward III, so called from town of Clare, Suffolk, whose heiress Lionel married. Used as a masc. proper name from late 19c. As a type of four-wheeled closed carriage, named for the Duke of Clarence, later William IV.[Clarence etymology, Clarence origin, 英语词源]