Jamshid
The name Jamshid is originally a compound of two parts, Jam and shid, corresponding to the Avestan names Yima and Xšaēta, *Xšaitah meant "bright, shining" or "radiant". The modern Turkish name Cem is derived from Persian Jam. also the word Ajam is derived from the word Jam. according to the book Documents on the Persian Gulf's name  the Persian jam  is the root of Arabic Ajam, assuming that this Arabic word for the Persian-speaking population was derived from a Persian endonym, meaning the people of Jam.