English word enjoin comes from Proto-Italic *jungō (To join. To yoke.)

Detailed word origin of enjoin

Dictionary entry	Language	Definition
*jungō	Proto-Italic (itc-pro)	To join. To yoke.
iungere	Latin (lat)
joindre	Old French (fro)	To join; to join onto. To meet up with; to go and see.
ioindre	Middle French (frm)	To join (become a part of something).
joindre	French (fra)	To join. To join up.
iniungo	Latin (lat)	I enjoin or charge. I impose. I join or fasten. I unite.
enjoindre	Old French (fro)
enjoin	English (eng)	(transitive, chiefly, literary) To lay upon, as an order or command; to give an injunction to; to direct with authority; to order; to charge.. (transitive, legal) To prohibit or restrain by a judicial order or decree; to put an injunction on.

Words with the same origin as enjoin