Where does “yáśas” come from?

yáśas (Proto-Indo-Aryan) comes from Proto-Indo-Iranian yáćas, from Proto-Indo-European yékos, from Proto-Indo-European yek- — to utter.

Ancestry of “yáśas”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-Iranian	yáćas	glory, fame, renown; dignity, honor
2	Proto-Indo-European	yékos	—
3	Proto-Indo-European	yek-	to utter

yáśas — Etymology, Origin & Word History | Etymology Explorer