Where does “dyal” come from?

dyal (Middle French) comes from Latin diālis, from Latin diēs, from Proto-Italic djēm, from Proto-Italic *djous, from Proto-Indo-European dyḗws, from Proto-Indo-European dyéws, from Proto-Indo-European dyew- — to be bright; sky, heaven.

Ancestry of “dyal”, step by step

dyal traces back through two separate lines of ancestry.

via Latin diālis

StepLanguageWordMeaning
1LatindiālisOf or belonging to the god Jupiter
2LatindiēsA day, particularly
3Proto-Italicdjēmaccusative singular of *djous
4Proto-Italic*djous
5Proto-Indo-Europeandyḗwssky, heaven; sky god
6Proto-Indo-Europeandyéwssky, heaven
7Proto-Indo-Europeandyew-to be bright; sky, heaven

via Proto-Brythonic diɣal

StepLanguageWordMeaning
1Proto-Brythonicdiɣal
2Proto-Celticdī-galā

Words derived from “dyal

Every word from Proto-Indo-European dyew-Every word from Proto-Indo-European dyéwsEvery word from Proto-Indo-European dyḗws