Where does “dydd Sul” come from?

dydd Sul (Welsh) comes from Welsh dydd, from Middle Welsh dyð, from Old Welsh did, from Proto-Brythonic dið, from Proto-Celtic dīyos, from Proto-Indo-European dyḗws, from Proto-Indo-European dyéws, from Proto-Indo-European dyew- — to be bright; sky, heaven.

dydd Sul (Welsh): Sunday

Definitions

  1. Sunday

Ancestry of “dydd Sul”, step by step

dydd Sul traces back through 3 separate lines of ancestry.

via Welsh dydd

StepLanguageWordMeaning
1Welshdyddday, daytime
2Middle Welshdyðday
3Old Welshdidday
4Proto-Brythonicdiðday, daytime
5Proto-Celticdīyosday
6Proto-Indo-Europeandyḗwssky, heaven; sky god
7Proto-Indo-Europeandyéwssky, heaven
8Proto-Indo-Europeandyew-to be bright; sky, heaven

via Welsh Sul

StepLanguageWordMeaning
1WelshSulSunday
2Middle WelshSul—
3Latinsōl—
4Proto-Indo-Europeansóh₂wl̥sun

via Latin dies Solis

StepLanguageWordMeaning
1Latindies Solissun's day
Every word from Proto-Indo-European dyew- →Every word from Proto-Indo-European dyéws →Every word from Proto-Indo-European dyḗws →