Where does “dydd Mawrth” come from?
dydd Mawrth (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.
Ancestry of “dydd Mawrth”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Welsh | dydd | day, daytime |
| 2 | Middle Welsh | dyð | — |
| 3 | Old Welsh | did | day |
| 4 | Proto-Brythonic | dið | day, daytime |
| 5 | Proto-Celtic | dīyos | day |
| 6 | Proto-Indo-European | dyḗws | sky, heaven; sky god |
| 7 | Proto-Indo-European | dyéws | — |
| 8 | Proto-Indo-European | dyew- | to be bright; sky, heaven |