monger

The noun is derived from Middle English mongere, mangere (“dealer, merchant, trader”), from Old English mangere (“dealer, merchant, trader”), from Proto-West Germanic *mangārī (“dealer, merchant, monger”), from Latin mangō (“dealer, trader”) + Proto-West Germanic *-ārī (suffix forming agent nouns, especially denoting occupations). The further etymology of mangō is uncertain; the following possibilities have been suggested:

From Ancient Greek μαγγανεύω (manganeúō, “to use charms or philtres; to cheat, play tricks; to dress food artificially to make it appear better”), from μάγγᾰνον (mángănon, “means of bewitching, charm, philtre”) (possibly from Proto-Indo-European *meng- (“to dress, embellish, trim”); or from Arabic ن ج ل (n j l, root relating to pouring out or thrusting)) + -εύω (-eúō, suffix forming denominative verbs of activity or condition).

From Latin *manicō, *manigō (“deal, trade; to handle, manage (?)”), from manus (“hand”); further etymology uncertain, possibly ultimately from Proto-Indo-European *(s)meh₂- (“to beckon, signal”), or *mon-u-.

The verb is either derived from the noun, or is a back-formation from mongering (adjective or noun).

Origin uncertain, possibly from monger (“dealer or trader in a specific commodity”) (etymology 1); or related to Middle English mangbot (“type of fishing boat used on the Thames”).