Where does “Ioannis” come from?

Ioannis comes from Greek Ιωάννης, from Koine Greek Ἰωάννης, from Hebrew יוֹחָנָן, ultimately from Hebrew יְהוֹחָנָן, a name meaning "God is gracious."

Ancestry of “Ioannis”, step by step

Step	Language	Word	Meaning
1	Greek	Ιωάννης	Any of the religious figures named John in the Bible, such as the John the Apostle or John the Baptist
2	Koine Greek	Ἰωάννης	—
3	Hebrew	יוחנן	Yahweh is gracious
4	Hebrew	חנון	gracious, merciful, compassionate; passive...
5	Moroccan Arabic	خنونة	mucus, snot
6	Arabic	خُنَّة	—

Every word from Arabic خُنَّة →Every word from Moroccan Arabic خنونة →Every word from Hebrew חנון →