Where does “(x)šwáš” come from?

(x)šwáš (Proto-Iranian) comes from Proto-Indo-Iranian šwáćš, from Proto-Indo-European swéḱs — six.

Ancestry of “(x)šwáš”, step by step

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