Where does “Emrys” come from?

Emrys (Welsh) comes from Proto-Brythonic Ėmrös, from Latin ambrosius, from Ancient Greek ἀμβρόσιος, from Ancient Greek ἄμβροτος, from Proto-Indo-European n̥mr̥tós, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

Ancestry of “Emrys”, step by step

StepLanguageWordMeaning
1Proto-BrythonicĖmrös—
2LatinambrosiusAmbrosial, divine, immortal
3Ancient Greekἀμβρόσιοςimmortal, divine
4Ancient Greekἄμβροτοςimmortal, divine; belonging to the gods
5Proto-Indo-Europeann̥mr̥tósimmortal
6Proto-Indo-Europeann̥-not, un-
7Proto-Indo-Europeannenot
Every word from Proto-Indo-European ne →Every word from Proto-Indo-European n̥- →Every word from Proto-Indo-European n̥mr̥tós →