Astray

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Middle English (in the sense ‘distant from the correct path’): from an Anglo-Norman French variant of Old French estraie, past participle of estraier, based on Latin extra ‘out of bounds’ + vagari ‘wander’.

wiktionary

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From Middle English astraien or by apheresis straien, from Old French estraier(“to stray”), from late Medieval Latin extravagari(“to wander beyond”), from Latin extra(“beyond”) + vagārī(“to wander, stray”). [1]

etymonline

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astray (adv.)

early 14c., o strai, "away from home; lost, wandering" (of cattle), borrowed and partially nativized from Old French estraie, past participle of estraier "astray, riderless (of a horse), lost," literally "on stray" (see stray (v.)). Figurative use is from late 14c.