Arthur is the name of the central character in Arthurian legend, a 6th-century king of the Britons who resisted Saxon invaders. He may or may not have been based on a real person. He first appears in Welsh poems and chronicles (perhaps briefly in the 7th-century poem Y Gododdin and more definitively and extensively in the 9th-century History of the Britons [1]). However, his character was not developed until the chronicles of the 12th-century Geoffrey of Monmouth [2]. His tales were later taken up and expanded by French and English writers.
The name came into general use in England in the Middle Ages due to the prevalence of Arthurian romances, and it enjoyed a surge of popularity in the 19th century. Famous bearers include German philosopher Arthur Schopenhauer (1788-1860), mystery author and Sherlock Holmes creator Arthur Conan Doyle (1859-1930), and science-fiction author Arthur C. Clarke (1917-2008).
This name has been used in the English-speaking world since the Protestant Reformation. In America it received a boost in popularity after the birth of Esther Cleveland (1893-1980), the daughter of President Grover Cleveland [1].
More often spelt Orrin when used in modern times. Oren also occurs, and there may be confusion with Oran. George Bernard Shaw invented the feminine name Orinthia in The Apple Cart, two years before O'Neill's play. In the 17th century the poet Cowley made use of another feminine name which appears to belong to the same group, Orinda (though this may have been a shortening of Dorinda). (Source: Dunkling & Gosling, 1983)
This was the name of a 13th-century Italian saint who made clothes for the poor. As an English name, it has never been common.