Where does “Mercurie” come from?

Mercurie (Middle English) comes from Latin Mercurius, from Latin merx, from Proto-Italic *merks.

Ancestry of “Mercurie”, step by step

Step	Language	Word	Meaning
1	Latin	Mercurius	Mercury; a Roman god associated with speed and...
2	Latin	merx	merchandise, commodity; goods, wares
3	Proto-Italic	*merks	—

Mercurie — Etymology, Origin & Word History | Etymology Explorer