"Son of Shem, born the year after the Deluge. He died at the age" "of 438 years (Gen. 11:10-13; 1 Chr. 1:17, 18; Luke 3:36). He" "dwelt in Mesopotamia, and became, according to the Jewish" "historian Josephus, the progenitor of the Chaldeans. The" tendency is to recognize in the word the name of the country nearest the ancient domain of the Chaldeans. Some regard the word as an Egypticized form of the territorial name of Ur "Kasdim, or Ur of the Chaldees."

See where Arphaxad occurs in the Bible...

Definition of Arphaxad:
"a healer; a releaser"