y-(3rd person object prefix) + ni-(terminative aspect) + -Ø-(3rd person subject prefix) + -ł-(classifier) + -máás(“to roll”, imperfective verb stem). The stem -máás(“globular, spherical, ball-like shape”) is cognate with -bą́ą́z(“hooplike, ringlike shape”), and they have the same origin, which possibly is Proto-Athabaskan*wątsʼ(“roll”)