As a Christian name, Ruth has been in use since the Protestant Reformation. In England it was associated with the archaic word ruth meaning "pity, compassion" (now only commonly seen in the word ruthless). The name became very popular in America following the birth of "Baby" Ruth Cleveland (1891-1904), the daughter of President Grover Cleveland.
As a given name it was mostly masculine in America until around 2009. It was already rising in popularity for girls when singer Mariah Carey gave it to her daughter born 2011 (though this probably helped accelerate it).
This name was borne by a 6th-century Byzantine emperor. Another notable bearer was Maurice of Nassau (called Maurits in Dutch), a 17th-century prince of Orange who helped establish the Dutch Republic. The name has been used in England since the Norman Conquest, usually in the spelling Morris or Moris.
An influential bearer of the name was Martin Luther (1483-1546), the theologian who began the Protestant Reformation. The name was also borne by five popes (two of them more commonly known as Marinus). Other more recent bearers include the German philosopher Martin Heidegger (1889-1976), the American civil rights leader Martin Luther King Jr. (1929-1968), and the American filmmaker Martin Scorsese (1942-).
American writers Jack London (1876-1916) and Jack Kerouac (1922-1969) were two famous bearers of this name. It is also borne by the actor Jack Nicholson (1937-) and the golfer Jack Nicklaus (1940-). Apart from Nicklaus, none of these famous bearers were given the name Jack at birth.
In the United Kingdom this form has been bestowed more frequently than John since the 1990s, being the most popular name for boys from 1996 to 2008.
Gawain was a popular hero in medieval tales such as those by Chrétien de Troyes, where his name appears in the French form Gauvain or Gauvains. He is the main character of the 14th-century anonymous poem Sir Gawain and the Green Knight, in which he accepts a potentially fatal challenge from the mysterious Green Knight.
In Greek legend Clytemnestra was the wife of Agamemnon and the mother of Orestes and Electra. While her husband was away during the Trojan War she took a lover, and upon his return she had Agamemnon murdered. She was subsequently killed by her son Orestes.
As an English Christian name, Abraham became common after the Protestant Reformation. A famous bearer was the American president Abraham Lincoln (1809-1865), who pushed to abolish slavery and led the country through the Civil War.