Accord

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Old English, from Old French acorder ‘reconcile, be of one mind’, from Latin ad- ‘to’ + cor, cord- ‘heart’; influenced by concord.

wiktionary

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From Middle English accorden, acorden, borrowed from Old French acorder (compare modern French accord and accorder), from Vulgar Latin *accordō, accordāre(“to be heart to heart with”), formed from Latin ad + cor(“heart”).

etymonline

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accord (v.)

early 12c., "come into agreement," also "agree, be in harmony," from Old French acorder "agree, be in harmony" (12c.), from Vulgar Latin *accordare "make agree," literally "be of one heart, bring heart to heart," from Latin ad "to" (see ad-) + cor (genitive cordis) "heart" (used figuratively for "soul, mind"), from PIE root *kerd- "heart." Compare concord, discord. Related: Accorded; according.

accord (n.)

late 13c., "agreement, harmony of opinions," accourd, acord, from Old French acorde, acort "agreement, alliance," a back-formation from acorder "reconcile, agree, be in harmony" (see accord (v.)). Meaning "will, voluntary impulse or act" (as in of one's own accord) is from mid-15c.