Where does “mííl” come from?

mííl (Navajo) comes from Spanish mil, from Old Spanish mil, from Latin Mīlle, from Proto-Italic smīɣeslī, from Proto-Indo-European smih₂ǵʰéslih₂.

mííl (Navajo): thousand; million

Definitions

Step	Language	Word	Meaning
1	Spanish	mil	thousand
2	Old Spanish	mil	—
3	Latin	Mīlle	—
4	Proto-Italic	smīɣeslī	—
5	Proto-Indo-European	smih₂ǵʰéslih₂	—

mííl — Etymology, Origin & Word History | Etymology Explorer