Where does “iulius” come from?

iulius (Middle English) comes from Anglo-Norman julie, from Old French jule, 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.

Ancestry of “iulius”, step by step

iulius traces back through two separate lines of ancestry.

via Anglo-Norman julie

StepLanguageWordMeaning
1Anglo-Normanjulie
2Old Frenchjule
3LatinIūliusOf the gens Julia, a patrician Roman family
4LatiniuppiterJupiter god of the sky and ruler of the Roman pantheon
5Proto-Italicdjous patērJupiter
6Proto-Italic*djous
7Proto-Indo-Europeandyḗwssky, heaven; sky god
8Proto-Indo-Europeandyéwssky, heaven
9Proto-Indo-Europeandyew-to be bright; sky, heaven

via Old French julie

StepLanguageWordMeaning
1Old Frenchjulie
Every word from Proto-Indo-European dyew-Every word from Proto-Indo-European dyéwsEvery word from Proto-Indo-European dyḗws