Ajam
according to the new finding "Ajam infact had a root in the persian word  Jam Jamshid The stories of "Jam and Jamshed and the word Molouk Ajam (Persian emperor) were well known to the Arabs before Islam and the word Molouk Ajam (Ajam kings) and Molk e Ajam(persia) were used in poems of famous 7 Arab poets of Jahiliyyah (pre Islam). one of the famous Arab figures Nadr ibn al-Harith wrote a book about the stories of the Molouk of Ajam (persian kings)Rustam Naqsh-e Rustam and Jamshid and Fereydun and presented it to the new Muslims and said that my book is more important than the stories of Muhammad.  Al-A'sha another  famous  Arabic Jahiliyyah (pre Islam) poet from ArabiaNajd, had wrote poems describing Ajam/Persian king(Molouk Ajam) one of the  Al-A'sha poem is:" أَوْ عَاتِقًا مِنْ أَذْرُعَاتٍ مُعَتَّقًا مِمَّا تَعَتَّقَهُ مُلُوكُ الأَعْجَمِ For the first time in the Umayyad period, the derogatory use of the word Ajam applied to the Persians. but during Abbasid and after  The word Ajam was used for the Persians not only for humiliating but also a source of pride, as some Arabs even in The pre-Islamic period proudly narrated the glorious stories of the Molouk(kings) of Ajam and the Molk of Jam (Persia).the Arab poets Yaqut al-Hamawi  and Al-Mutawakkil wrote: "I am the son of the honors Offspring of Jam(jamshid) holder of the glory legacy of Persian kings.انا ابن المکارم من النسل جم و حائز ارث ملوک العجم