Mononymous person
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A mononymous person is a person who is known and addressed by a single name. Such names are called mononyms. In some cases, the person was known by a composed name (polynym) before, and selected a single name. Today, this is often the case with artists, who select a stage name.
In many cultures, people only had one name. This is the case of Ancient Greece. Composed names were only used to avoid confusion. Both Zeno of Elea and Zeno of Citium were called Zeno, but the origin was added to avoid confusing the two. In Ancient Rome, people had a composed name which included a clan name and a family name, which did not change. While we refer to Cicero as Cicero, his real name was Marcus Tullius Cicero. Sometimes he is called Tully in English. Other people called Tullius include Manius Tullius Longus, a Roman consul, about 500 BC, and Quintus Tullius Cicero, one of Caesars generals. Nero was known as Nero Claudius Caesar Augustus Germanicus.
After the Romans, composed names started to be more commonplace in the Middle Ages. In the Americas, mononyms survived until the early 20th century. Examples include Pocahontas (1595-1617) and Geronimo (1829-1909). Pocahontas married and English settler, and took the name Rebecca Rolfe after her marriage.
Royals usually adopt a single name. Sometimes, a numeral is added. That way, Elizabeth I (1533-1603) and Elizabeth II (born 1926) both have a surname, but it is not used.
Similarly, popes select a single name, when they are elected. The current pope is called Jorge Mario Bergoglio, but since his becoming pope, everyone has called him Pope Francis.
In other cases, a person may select a single name from their polynym or adopt a mononym as a chosen name, pen name, stage name, or regnal name. A popular nickname may effectively become a mononym, in some cases adopted legally. For some historical figures, a mononym is the only name that is still known today.
