South German: 1. habitational name for someone from Reis or Reissen in Bavaria (see Reis 1). 2. occupational name from Middle High German reisære ‘warrior’, ‘traveler’. 3. South German: topographic name for someone who lived near a thicket (see Rieser 1 and Riser 1). 4. variant spelling of Reisser, an occupational name for a woodcutter, Middle High German rīsser.