Jamieson, Fausset and Brown on Isaiah 41:9

9. Abraham, the father of the Jews, taken from the remote Ur of the Chaldees. Others take it of Israel, called out of Egypt (De 4:37; Ho 11:1).

from the chief men--literally, "the elbows"; so the joints; hence the root which joins the tree to the earth; figuratively, those of ancient and noble stock. But the parallel clause "ends of the earth" favors Gesenius, who translates, "the extremities of the earth"; so Jerome.