Old English wrencan "to twist," from Proto-Germanic *wrankjan (cognates: Old High German renken, German renken "to twist, wrench," Old English wringan "to wring"), from PIE *wreng- "to turn" (cognates: Sanskrit vrnakti "turns, twists," Lithuanian rengtis "to grow crooked, to writhe"), nasalized variant of *werg- "to turn" (cognates: Latin vergere "to turn, tend toward"), from root *wer- (3) "to turn, bend" (see versus). Related: Wrenched, wrenching.

Old English wrenc "a twisting, artifice, trick;" see wrench, v.. The meaning "tool with jaws at one end for turning or holding" is first recorded 1794.