Where does “Δημήτρης” come from?

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

Δημήτρης (Greek): Dimitris