Verse 3
Sheba - From whom sprang the Sabeans, who robbed Job of his cattle. See Bochart and Calmet.
Asshurim, and Letushim, and Leummim - We know not who these were, but as each name is plural they must have been tribes or families, and not individuals. Onkelos interprets these words of persons dwelling in camps, tents, and islands; and Jonathan ben Uzziel calls them merchants, artificers, and heads or chiefs of people.