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