Etymology of the word Isphahan

Till now several books and articles have been written explaining the history of Isphahan,but throughout these works little has been written about the historical changes and the root of this word. The names of many geographical places are still unknown due to different narrations. We can easily find out the original names of many places with the help of the phonetic changes in their names. To write this article at first all the geographical text written by the pre Islamic or Islamic authors was collected, secondly the view of different German linguists regarding phonetic changes was gathered from different books available in the libraries. In the beginning of this article a brief history and the meaning of the word Isphahan is being given. This information is collected from different historical sources.Moreover the phonetic changes from the Indo European till the Modern Persian era in the two reconstructed words ‘Sipah’(army) and ‘Asb’(horse) have also been pointed out. As a conclusion it can be said that on the basis of the phonetic changes in the above mentioned words it is apprehended that the word Sepah is linked to Isphahan.