In the fourth issue of «Notes on Shahnameh», the origin of some other proper names of the Shahnameh will be discussed. These names include Pashtun, Fariborz, Zarvan, and Eshtad. About the name Pashtun, there was a mistake in the past that still exists in Persian writings. There is a subtle point in the construction of the name Fariborz, which has apparently been hidden from the researchers,And Zarvan and Eshtad are among the names that have been misspelled in Shahnameh. In these few notes, an attempt has been made to correct the defects of previous scholars›,opinions, especially the defects of Persian writings.