Where does “Aadu” come from?
Aadu (Estonian) comes from Russian ад, from Old East Slavic адъ, from Old Church Slavonic адъ, from Ancient Greek ᾍδης, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.
Ancestry of “Aadu”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Russian | ад | Hades; hell |
| 2 | Old East Slavic | адъ | — |
| 3 | Old Church Slavonic | адъ | hell |
| 4 | Ancient Greek | ᾍδης | — |
| 5 | Proto-Indo-European | n̥- | not, un- |
| 6 | Proto-Indo-European | ne | not |