Where does “newin(t)as” come from?

newin(t)as (Proto-Balto-Slavic) comes from Proto-Indo-European h₁néwn̥ — nine.

Ancestry of “newin(t)as”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	h₁néwn̥	nine

newin(t)as — Etymology, Origin & Word History | Etymology Explorer