This name was common among continental European royalty during the Middle Ages, and it was popularized in Britain by the German House of Hanover when they inherited the British throne in the 18th century. It was the name of characters in the novels Tom Jones (1749) by Henry Fielding and The Vicar of Wakefield (1766) by Oliver Goldsmith.
In the United States this name was only moderately common until the 1990s when it began rising in popularity, eventually becoming the most popular for girls from 2011 to 2013. A famous bearer is the Italian actress Sophia Loren (1934-).
A famous bearer of the surname was James Madison (1751-1836), one of the authors of the American constitution who later served as president (and after whom Madison Avenue was named).
This name was moderately popular through most of the 20th century, and became very popular around the turn of the 21st century. It was the highest ranked name for girls in the United States from 1996 to 2007, attaining similar levels in other English-speaking countries around the same time.
Famous bearers include the British author Emily Brontë (1818-1848), known for the novel Wuthering Heights, and the American poet Emily Dickinson (1830-1886).