Английский Этимологический словарь - register (n.)

- c.1378, from M.L. registrum, alteration of L.L. regesta "list, matters recorded," from L. regesta, neuter pl. of regestus, pp. of regerere "to record," from re- "back" + gerere "carry, bear." Some senses influenced by association with L. regere "to rule." Cash register is from 1875, from earlier meaning "device by which data is automatically recorded" (1830).