Where does “སུམ་ཅུ” come from?

སུམ་ཅུ (Tibetan) comes from Tibetan གསུམ, from Proto-Sino-Tibetan *kV-sum — three.

སུམ་ཅུ (Tibetan): thirty

Definitions

  1. thirty

Ancestry of “སུམ་ཅུ”, step by step

སུམ་ཅུ traces back through two separate lines of ancestry.

via Tibetan གསུམ

StepLanguageWordMeaning
1Tibetanགསུམthree
2Proto-Sino-Tibetan*kV-sumthree

via Tibetan བཅུ

StepLanguageWordMeaning
1Tibetanབཅུten; future of འཆུ
2Proto-Sino-Tibetants(j)i(j) ~ tsjajten
Every word from Proto-Sino-Tibetan *kV-sum →Every word from Tibetan གསུམ →