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.
This name has been used occasionally in England since the 12th century. It was not common in the English-speaking world until the end of the 20th century.
This name was also borne by a powerful 10th-century ruler of Bulgaria who expanded the empire to its greatest extent.