Etymon
enm-marchaunt-english-merchant-protoindoeuropean-mon-protogermanic-mann-protowest-germanic-mann-old-english-mann-middle-english-man-middle-english-man-english-man-english-merchantman-from-merchant-man
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.