Heydar is a common male given name in Greater Iran, particularly in Iran and Azerbaijan.
A variant of the Arabic name Haydar (also spelt Heidar, Haider, and other variants), it was a cognomen of Ali, who was known for his courage in battle.
[citation needed] Heydar is sometimes transliterated as Gaidar or Geidar, from the Cyrillic spelling Гейдар.
[citation needed] The name may refer to: