Ioannis or Ioannes (Greek: Ιωάννης), shortened to Giannis or Yannis (Γιάννης) is a Greek given name cognate with Johannes and John and the Arabic name Yahya . Notable people with the name include: Ioannis I, Tzimiskis, Byzantine Emperor. Ioannis Agorastos-Plagis (John Plagis), Southern Rhodesian flying ace during World War II. Ioannis Alevras, Greek politician who served as Speaker of the Hellenic Parliament. Ioannis Altamouras, Greek painter of the 19th century. Ioannis Anastassakis, professionally known as John Aniston, a Greek-born American actor.
https://en.wikipedia.org/wiki/Ioannis