Arpakhshad was one of the 5 sons of Shem and the ancestor of Abraham (see Genesis 11:10). Many have identified him with Ur of the Chaldees/Casdim (see note on Genesis 11:28) a.k.a. Urfa-Khassid (Edessa) in North Messopotamia not to be confused with the city of Ur on the lower Euphrates near the Persian Gulf (Yov'loth 9:4). Urfa-Khassid is where Josephus placed the speakers of the language he called Chaldaean a dialect of Aramaic, whom he identified as the descendants of Arpakhshad. Traditional Jewish and Islamic traditions place Abraham's birth in Urfa-Khessed until Victorian English gentlement like Woolsey told the world otherwise. It is an indication of the influence of Victorian England's hegemony that many Jewish Rabbis have adopted this British view over the traditional view. The Targum translates the name as Arphasdai (Targum on 1 Chronicles 1:17,18). See Herodotus 6:5.
The speakers of a language now misnamed Hattic (again by Victorian English gentlemen), and Hurrian were living in that area.
According to Petrines, Anush Uthra ordered that a messenger be assigned to each of the 72 nations. Addai (Thaddeus) was the one of the Seventy Disciples who was sent to Edessa. Addai was one of the 6 disciples answerable directly to the apostle Thomas. The language of the area was supposed to have been an agglutinative language related to Elamite.