Where does “Нуристон” come from?

Нуристон (Tajik) comes from Tajik нур, from Arabic نُور, from Classical Persian جَان, from Middle Persian 𐫃𐫏𐫀𐫗, from Proto-Iranian *wyaHnáH, from Proto-Indo-Iranian wyaHnás, from Proto-Indo-European h₂enh₁‑ — to breathe.

Ancestry of “Нуристон”, step by step

StepLanguageWordMeaning
1Tajikнурlight
2Arabicنُورlight, brightess; ray of light, light beam;...
3Classical Persianجَان—
4Middle Persian𐫃𐫏𐫀𐫗—
5Proto-Iranian*wyaHnáH—
6Proto-Indo-IranianwyaHnás—
7Proto-Indo-Europeanh₂enh₁‑to breathe
Every word from Proto-Indo-European h₂enh₁‑ →Every word from Proto-Indo-Iranian wyaHnás →Every word from Proto-Iranian *wyaHnáH →