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.
German: 1. habitational name for someone from the city of Ulm. The placename is from the root uel, an unattested word meaning ‘turn’, ‘wind’, ‘roll’ or from el- or ol- ‘flow’, a reference in either case to the influx of the Blan river into the Danube. 2. from the Germanic personal name Odolmar, composed of the elements odal ‘inherited property’ + mār ‘famous’.