Commerce

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mid 16th century (in commerce (sense 2)): from French, or from Latin commercium ‘trade, trading’, from com- ‘together’ + mercium (from merx, merc- ‘merchandise’).

wiktionary

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Borrowed from Middle French commerce, from Latin commercium.

etymonline

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commerce (n.)

1530s, "social intercourse;" 1580s, "interchange of goods or property, trade," especially trade on a large scale by transportation between countries or different parts of the same country, from French commerce (14c.), from Latin commercium "trade, trafficking," from com "with, together" (see com-) + merx (genitive mercis) "merchandise" (see market (n.)). It also was the name of a card game very popular in 1770s and '80s. As a verb, "have dealings with," 1590s. Related: Commerced, commercing.