As an English name, it became popular due to the Fleetwood Mac song Rhiannon (1976), especially in the United Kingdom and Australia.
In some cases this name can be a short form of longer names that start with Leo, such as Leonard.
This name was borne by the heroine of the Polish writer Juliusz Słowacki's play Fantazy (1841, published 1866).
Due to its favourable meaning, this name was popular among early Christians, being borne by many early saints and four popes. It has been used in England since the Middle Ages, though it has been more popular in continental Europe. A notable bearer was the German composer Felix Mendelssohn (1809-1847).
The popularity of the name in continental Europe was due to the fame of Charles the Great (742-814), commonly known as Charlemagne, a king of the Franks who came to rule over most of Europe. His grandfather Charles Martel had also been a noted leader of the Franks. It was subsequently the name of several Holy Roman emperors, as well as rulers of France, Spain, Portugal, Sweden and Hungary (in various spellings). After Charlemagne, his name was adopted as a word meaning "king" in many Eastern European languages, for example Czech král, Hungarian király, Russian король (korol), and Turkish kral.
The name did not become common in Britain until the 17th century when it was borne by the Stuart king Charles I. It had been introduced into the Stuart royal family by Mary Queen of Scots, who had been raised in France. Two other kings of the United Kingdom have borne this name, including the current monarch.
Other famous bearers include naturalist Charles Darwin (1809-1882) who revolutionized biology with his theory of evolution, novelist Charles Dickens (1812-1870) who wrote such works as Great Expectations and A Tale of Two Cities, French statesman Charles de Gaulle (1890-1970), and American cartoonist Charles Schulz (1922-2000), the creator of the Peanuts comic strip.
A noted bearer is John Rackham (1682 – 1720), commonly known as Calico Jack, an English pirate captain operating in the Bahamas and in Cuba during the early 18th century, his nickname derived from the calico clothing he wore.
Famous bearers include the Renaissance painter Antonio Pisanello (c. 1395-1455) and the Baroque composer Antonio Vivaldi (1678-1741). It is also the name of the main character in The Merchant of Venice (1596) by William Shakespeare.
The name became regularly used in the Christian world due to the fame of Saint Anthony the Great, a 4th-century Egyptian hermit who founded Christian monasticism. Its popularity was reinforced in the Middle Ages by the 13th-century Saint Anthony of Padua, the patron saint of Portugal. It has been commonly (but incorrectly) associated with Greek ἄνθος (anthos) meaning "flower", which resulted in the addition of the h to this spelling in the 17th century.