Short form of Clifford, now also sometimes of Clifton. It has been used occasionally as a given name, especially since the advent in the 1950s of the pop singer Cliff Richard (real name Harry Webb). It has sometimes also been associated with Clive.
English (Norman) and French: nickname from Old French druerie ‘love’, ‘friendship’, a derivative of dru ‘lover’, ‘friend’ (see Drew 3). In Middle English the word also had the concrete meanings ‘love affair’, ‘love token’, ‘sweetheart’.