Exchange
late Middle English: from Old French eschange (noun), eschangier (verb), based on changer (see change). The spelling was influenced by Latin ex- ‘out, utterly’ (see ex-1).
wiktionary
From Middle English eschaunge, borrowed from Anglo-Norman eschaunge, from Old French eschange (whence modern French échange), from the verb eschanger, from Vulgar Latin *excambiāre, present active infinitive of *excambiō (from Latin ex with Late Latin cambiō). Spelling later changed on the basis of ex- in English.
From Middle English eschaungen, from Anglo-Norman eschaungier, Old French eschanger, from the Old French verb eschangier, eschanger (whence modern French échanger), from Vulgar Latin *excambiāre, present active infinitive of *excambiō (from Latin ex with Late Latin cambiō). Gradually displaced native Old English wrixlan, wixlan(“to change, exchange, reciprocate”) and its descendants, wrixle being one of them.
etymonline
exchange (n.)
late 14c., eschaunge, "act of reciprocal giving and receiving," from Anglo-French eschaunge, Old French eschange (Modern French échange), from Late Latin excambium, from excambiare, from Latin ex "out" (see ex-) + cambire "barter" (see change (v.)). The practice of merchants or lenders meeting at certain places to exchange bills of debt led to the meaning "building for mercantile business" (1580s).
exchange (v.)
late 15c. (Caxton), in commerce, "to part with in return for some equivalent, transfer for a recompense, barter," from Old French eschangier "exchange, barter" (Modern French échanger), from Vulgar Latin *excambiare (source of Italian scambiare); see exchange (n.). Non-commercial sense of "to give and receive reciprocally" is from c. 1600. Related: Exchanged; exchanging.
