As an English name, Aaron has been in use since the Protestant Reformation. This name was borne by the American politician Aaron Burr (1756-1836), notable for killing Alexander Hamilton in a duel.
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).
In the English-speaking world this name is now associated with a red muppet character from the children's television program Sesame Street.
There were a few medieval French and German saints bearing this name. It was also borne by an 8th-century Anglo-Saxon saint. In this case his name may represent an Old English cognate of the continental Germanic name.
The popularity of the saint led to the name being used by nine Byzantine emperors, including Michael VIII Palaeologus who restored the empire in the 13th century. It has been common in Western Europe since the Middle Ages, and in England since the 12th century. It has been borne (in various spellings) by rulers of Russia (spelled Михаил), Romania (Mihai), Poland (Michał), and Portugal (Miguel).
In the United States, this name rapidly gained popularity beginning in the 1930s, eventually becoming the most popular male name from 1954 to 1998. However, it was not as overwhelmingly common in the United Kingdom, where it never reached the top spot.
Famous bearers of this name include the British chemist/physicist Michael Faraday (1791-1867), musician Michael Jackson (1958-2009), and basketball player Michael Jordan (1963-).
This name has been borne by two kings of the Franks, two dukes of Normandy, and three kings of Scotland, including Robert the Bruce who restored the independence of Scotland from England in the 14th century. Several saints have also had the name, the earliest known as Saint Rupert, from an Old German variant. The author Robert Browning (1812-1889) and poets Robert Burns (1759-1796) and Robert Frost (1874-1963) are famous literary namesakes. Other bearers include Robert E. Lee (1807-1870), the commander of the Confederate army during the American Civil War, and American actors Robert Redford (1936-), Robert De Niro (1943-) and Robert Downey Jr. (1965-).