Where does “अरुणाचल” come from?

अरुणाचल (Hindi) comes from Sanskrit अचल, from Sanskrit अ-, from Proto-Indo-Iranian a-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

Ancestry of “अरुणाचल”, step by step

अरुणाचल traces back through two separate lines of ancestry.

via Sanskrit अचल

StepLanguageWordMeaning
1Sanskritअचलa mountain, rock; the deity Acala
2Sanskritअ-un-, not; Used in the formation of imperfect,...
3Proto-Indo-Iraniana-un-, a-
4Proto-Indo-Europeann̥-not, un-
5Proto-Indo-Europeannenot

via Sanskrit अरुण

StepLanguageWordMeaning
1Sanskritअरुणa name for the sun; also of his charioteer, or...
2Proto-Indo-Iranian*Harunás—

Words derived from “अरुणाचल”

Every word from Proto-Indo-European ne →Every word from Sanskrit अ- →Every word from Proto-Indo-European n̥- →