Where does “アッサム” come from?

アッサム (Japanese) comes from English Assam, from Assamese অসম, from Sanskrit असम, from Proto-Indo-Iranian asmá, from Proto-Indo-European n̥smé, from Proto-Indo-European éǵh₂ — I.

Ancestry of “アッサム”, step by step

Step	Language	Word	Meaning
1	English	Assam	Short for Assam tea: tea from or similar to that...
2	Assamese	অসম	heterogenous, dissimilar, unequal
3	Sanskrit	असम	unplain
4	Proto-Indo-Iranian	asmá	us
5	Proto-Indo-European	n̥smé	us
6	Proto-Indo-European	éǵh₂	I

Every word from Proto-Indo-European éǵh₂ →Every word from Proto-Indo-European n̥smé →Every word from Proto-Indo-Iranian asmá →