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Siāmak (Persian: سيامک [sɪjɑˈmæk], sometimes transliterated as Siyamak or Siamac) is a Persian given name, and hence occurring mostly in the regions populated by the Iranian people. In the Persian language epic, the Shahnameh, Siamak is the beloved son of Keyumars, the first human.
Ferdowsi's great epic poem begins with the story of Keyumars, the first king to arise among humans, who at that time lived in mountain caves and wore the skins of leopards. God (Hormazd) granted him the supernatural radiance called farr reserved for kings. His son was Siāmak and was beloved by all except the destructive spirit Ahriman), who raised an army under the command of his own demonic son. When the divine figure Sorush warned Keyumars, Siāmak led an army of his own. Siāmak accepted a challenge to single combat and died at the hands of the demon.
Keyumars mourned for a year, and then Sorush advised him to fight Ahriman once more. Siāmak's son Hushang led the army that defeated Ahriman's son, whom he bound and beheaded.
Keyumars died after a thirty-year reign, leaving his throne to Hushang.
- black haired man (from Persian siāh black + moo hair + -ak suffix of endearment)
- bringer of joy
- great emperor.
Notable people named Siamak 
- Siamak Pourzand: Iranian journalist and film critic
- Siamak Shayeghi: Iranian film director and critic
- Siamak Taghaddos: Iranian-American entrepreneur
- A king's book of kings: the Shah-nameh of Shah Tahmasp, an exhibition catalog from The Metropolitan Museum of Art (fully available online as PDF), which contains material on Siamak