Where does “hai mồn” come from?

hai mồn (Tày) comes from Navajo -HAI, from Proto-Athabaskan *x̣αy — winter.

Ancestry of “hai mồn”, step by step

StepLanguageWordMeaning
1Navajo-HAIa winter, a year passes; {|...
2Proto-Athabaskan*x̣αywinter
Every word from Proto-Athabaskan *x̣αy →Every word from Navajo -HAI →