Ioannis is a traditionally masculine given name of Greek origin, meaning "God is gracious." It is derived from the Hebrew name Yochanan, which means "Yahweh (the Lord) is gracious" and is also the basis for the English name John. In Greece, Ioannis is often shortened to the familiar form Giannis or Yiannis. The name gained international recognition through notable individuals such as Greek basketball player Giannis Antetokounmpo, known by his nickname "Greek Freak.
The name Ioannis experienced significant fluctuations in popularity over the years, with notable peaks in recent times.