Where does “Bitsilly” come from?

Bitsilly (Navajo) comes from Navajo atsilí, from Proto-Athabaskan *-kʸə̓tɬʼə — younger brother.

Ancestry of “Bitsilly”, step by step

StepLanguageWordMeaning
1Navajoatsilíyounger brother, little brother
2Proto-Athabaskan*-kʸə̓tɬʼəyounger brother
Every word from Proto-Athabaskan *-kʸə̓tɬʼə →Every word from Navajo atsilí →