Where does “mīllēnus” come from?

mīllēnus (Latin) comes from Latin Mīlle, from Proto-Italic smīɣeslī, from Proto-Indo-European smih₂ǵʰéslih₂.

Ancestry of “mīllēnus”, step by step

Step	Language	Word	Meaning
1	Latin	Mīlle	—
2	Proto-Italic	smīɣeslī	—
3	Proto-Indo-European	smih₂ǵʰéslih₂	—

mīllēnus — Etymology, Origin & Word History | Etymology Explorer