Where does “coutumier” come from?
coutumier (French) comes from French coutume, from Middle French coustume, from Old French coustume, from Vulgar Latin consuetumen, from Latin cōnsuētūdō, from Latin cōnsuēscō, from Latin suēscō, from Proto-Indo-European swe-dʰh₁-sk- — to do, put, place.
coutumier (French): customary, usual
Ancestry of “coutumier”, step by step