The name Kay Khosrow derives from Avestan 𐬐𐬀𐬎𐬎𐬌 𐬵𐬀𐬊𐬯𐬭𐬀𐬎𐬎𐬀𐬢𐬵𐬀 Kauui Haosrauuaŋha,[2] meaning "seer/poet who has good fame".
In Avesta, Kay Khosrow has the epithet of 𐬀𐬭𐬱𐬀 𐬀𐬌𐬭𐬌𐬌𐬀𐬥𐬄𐬨 𐬛𐬀𐬒 𐬌𐬌𐬎𐬥𐬄𐬨 arša airiianąm dax́ iiunąm, meaning "stallion of the Aryan lands".
Kay Khosrow destroyed an idol temple by the Lake Chichast, and at the resurrection, he will collaborate with Saoshyants.
He is the son of Siyavash and Farangis, and when his father was killed by Garsivaz, Kay Khosrow was entrusted by Piran Viseh to some shepherds.
Convinced that Khosrow is just an idiot, Afrasiyab orders Piran to send him to his mother who lives in the city of Siyavashgerd, which was founded by his father.
Bizhan had become romantically involved with Manizheh, the daughter of Turanian king Afrasiab, after a brief encounter with her in the border of Iran and Turan.
As mentioned by Ali-Akbar Dehkhoda, it was believed that one could observe all the seven heavens of the universe by looking into it (از هفت فلک در او مشاهده و معاینه کردی).