Reaper

wiktionary

ref

From Middle English reper, repare, repere, *riper (the last, attested only in surnames Ryper, Riper, etc.), from Old English rīpere(“reaper”), equivalent to reap +‎ -er.

etymonline

ref

reaper (n.)

Middle English repere (early 14c. in surnames), "a harvester, one who cuts grain with a sickle or other instrument," replacing Old English ripere, agent noun from reap (v.). Sense of "a machine for cutting grain" is by 1844. As the name of a personification of death, from 1839.