Where does “juillet” come from?
juillet (Old French) comes from Old French juignet, from Old French juil, from Latin Iūlius, from Latin iuppiter, from Proto-Italic djous patēr, from Proto-Italic *djous, from Proto-Indo-European dyḗws, from Proto-Indo-European dyéws — to be bright; sky, heaven.
juillet (Old French): July
Ancestry of “juillet”, step by step