Where does “Denis” come from?

Denis (Old Portuguese) comes from Old French Denis, from Latin Dionȳsius, from Ancient Greek Διονύσιος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Denis”, step by step

Step	Language	Word	Meaning
1	Old French	Denis	—
2	Latin	Dionȳsius	tyrant of Syracuse
3	Ancient Greek	Διονύσιος	—
4	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
5	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Words derived from “Denis”

Dinís

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek Διονύσιος →