Where does “dydd Iau” come from?
dydd Iau (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 Iau (Welsh): Thursday
Definitions
- Thursday
Ancestry of “dydd Iau”, step by step
dydd Iau traces back through 3 separate lines of ancestry.
via Welsh dydd
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | Welsh | dydd | day, daytime |
| 2 | Middle Welsh | dyð | day |
| 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 | sky, heaven |
| 8 | Proto-Indo-European | dyew- | to be bright; sky, heaven |
via Welsh Iau
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | Welsh | Iau | Jupiter, Thursday |
| 2 | Middle Welsh | ieu | — |
| 3 | Brythonic | *Yow | — |
| 4 | Latin | Iovem | — |
via Latin dies iovis
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | Latin | dies iovis | Thursday |
| 2 | Latin | diēs | A day, particularly |
| 3 | Proto-Italic | djēm | accusative singular of *djous |
| 4 | Proto-Italic | *djous | — |