Where does “*šúwa” come from?

*šúwa (Proto-Nuristani) comes from Proto-Indo-Iranian šwáćš, from Proto-Indo-European swéḱs — six.

Ancestry of “*šúwa”, step by step

StepLanguageWordMeaning
1Proto-Indo-Iranianšwáćšsix
2Proto-Indo-Europeanswéḱssix
Every word from Proto-Indo-European swéḱs →Every word from Proto-Indo-Iranian šwáćš →