Where does “Johan” come from?

Johan (Old Leonese) comes from Latin Iōhannēs, from Latin Iōannēs, from Ancient Greek Ἰωάννης, from Hebrew יוחנן, from Hebrew חנון, from Moroccan Arabic خنونة, from Arabic خُنَّة.

Johan (Old Leonese): The name of several persons in the Christian Bible, among them John the Baptist, John the Apostle, John the Evangelist and John of Patmos