Yes

google

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Old English gēse, gīse, probably from an unrecorded phrase meaning ‘may it be so’.

wiktionary

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From Middle English yes, from Old English ġīese. Compare yea.

etymonline

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yes (adv.)

Old English gise, gese "so be it!," probably from gea, ge "so" (see yea) + si "be it!," from Proto-Germanic *sijai-, from PIE *si-, optative stem of root *es- "to be." Originally stronger than simple yea. Used in Shakespeare mainly as an answer to negative questions. As a noun from 1712. Yes-man is first recorded 1912, American English.