As a given name, Diana has been regularly used since the Renaissance. It became more common in the English-speaking world following Walter Scott's novel Rob Roy (1817), which featured a character named Diana Vernon. It also appeared in George Meredith's novel Diana of the Crossways (1885). A notable bearer was the British royal Diana Spencer (1961-1997), the Princess of Wales.
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].
In England, Sarah came into use after the Protestant Reformation. It was consistently popular in the 20th century throughout the English-speaking world, reaching the top of the charts for England and Wales in the 1970s and 80s.
Notable bearers include Sarah Churchill (1660-1744), an influential British duchess and a close friend of Queen Anne, and the French actress Sarah Bernhardt (1844-1923).
As an English name, it has been used occasionally since the 12th century. It is the name of a central character in Shakespeare's play The Two Gentlemen of Verona (1594).