The story
- Proto-Italic*merks
- Latinmerx
- Latinmercor
- Latinmercāns
- Anglo-Normanmarchaunt
- Middle Englishmarchaunt
- English todaymerchant
From Middle English marchaunt, from Anglo-Norman marchaunt, from mercans, from the verb mercor (“to trade, deal, sell”).
Etymology from Wiktionary, CC BY-SA 4.0.