Where does “Démétrios” come from?

Démétrios (French) comes from Ancient Greek Δημήτριος, from Ancient Greek Δημήτηρ, from Ancient Greek μήτηρ, from Proto-Hellenic mā́tēr, from Proto-Indo-European méh₂tēr — mother.

Ancestry of “Démétrios”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Δημήτριος	—
2	Ancient Greek	Δημήτηρ	Demeter
3	Ancient Greek	μήτηρ	mother; source or origin
4	Proto-Hellenic	mā́tēr	mother
5	Proto-Indo-European	méh₂tēr	mother

Every word from Proto-Indo-European méh₂tēr →Every word from Proto-Hellenic mā́tēr →Every word from Ancient Greek μήτηρ →