Err
Middle English (in the sense ‘wander, go astray’): from Old French errer, from Latin errare ‘to stray’.
wiktionary
From Middle English erren, from Old French errer(“to wander, err, mistake”), from Latin errō(“wander, stray, err, mistake”, verb), from Proto-Indo-European *h₁ers-(“to be angry, lose one's temper”). Cognate with Old English eorre, ierre(“anger, wrath, ire”), Old English iersian(“to be angry with, rage, irritate, provoke”), Old English ierre(“wandering, gone astray, confused”)
etymonline
err (v.)
c. 1300, from Old French errer "go astray, lose one's way; make a mistake; transgress," from Latin errare "wander, go astray," figuratively "be in error," from PIE root *ers- (1) "be in motion, wander around" (source also of Sanskrit arsati "flows;" Old English ierre "angry; straying;" Old Frisian ire "angry;" Old High German irri "angry," irron "astray;" Gothic airziþa "error; deception;" the Germanic words reflecting the notion of anger as a "straying" from normal composure). Related: Erred; erring.
