This was the name of two biblical men, Arioch was a king of Ellasar who was allied with Chedorlaomer (Gen. 14:1,9) and Captain of Nebuchadnezzar's guard (Dan. 2:14-15, 24-25).
Originally appears in the Book of Genesis chap. 14 as the "King of Ellasar", part of the confederation of kings who did battle with the kings of Sodom and Gomorrah and with Abraham in the vale of Siddim.