Pseudonym in the context of "Pen name"

William S. Lind (born July 9, 1947) is an American conservative author, described as being aligned with paleoconservatism. He is the author of many books and one of the first proponents of fourth-generation warfare (4GW) theory and is director of the American Conservative Center for Public Transportation. He used the pseudonym Thomas Hobbes in a column for The American Conservative.

2 Peter, also known as the Second Epistle of Peter and abbreviated as 2 Pet., is an epistle of the New Testament written in Koine Greek. It identifies the author as "Simon Peter" (in some translations, 'Simeon' or 'Shimon'), a bondservant and apostle of Jesus Christ" (2 Peter 1:1). The epistle is traditionally attributed to Peter the Apostle, but most critical scholars consider the epistle pseudepigraphical (i.e., authored by one or more of Peter's followers, using Peter as a pseudonym). Scholars estimate the date of authorship anywhere from AD 60 to 150.

A sobriquet (/ˈsoʊbrɪˌkeɪ, ˌsoʊbrɪˈkeɪ/ SOH-brih-kay, -⁠KAY) is a descriptive nickname, sometimes assumed, but often given by another. A sobriquet is distinct from a pseudonym in that it is typically a familiar name used in place of a real name without the need for explanation; it may become more familiar than the original name.

An example is Mohandas Gandhi, who is better known as Mahatma Gandhi ("mahatma" means "great soul" in Sanskrit).

A courtesy name (Chinese: 字; pinyin: zì; lit. 'character'), also known as a style name, is an additional name bestowed upon individuals at adulthood, complementing their given name. This tradition is prevalent in the East Asian cultural sphere, particularly in China, Japan, Korea, Taiwan and Vietnam. Courtesy names are a marker of adulthood and were historically given to men at the age of 20, and sometimes to women upon marriage.

Unlike art names, which are more akin to pseudonyms or pen names, courtesy names served a formal and respectful purpose. In traditional Chinese society, using someone's given name in adulthood was considered disrespectful among peers, making courtesy names essential for formal communication and writing.

Jean-François-Maurice-Arnauld Dudevant, known as Baron Dudevant but better known by the pseudonym Maurice Sand (30 June 1823 – 4 September 1889), was a French writer, artist and entomologist. He studied art under Eugène Delacroix and also experimented in various other subjects, including geology and biology.

He was the elder child and only son of George Sand, a French novelist and feminist, and her husband, Baron François Casimir Dudevant. In addition to his numerous novels, he is best remembered for his monumental study of commedia dell'arte – Masques et bouffons (comédie italienne), 1860.

The Commonitorium or Commonitory is a 5th-century Christian treatise written after the council of Ephesus under the pseudonym "Peregrinus" and attributed to Vincent of Lérins. It is known for Vincent's famous maxim: "Moreover, in the Catholic Church itself, all possible care must be taken, that we hold that faith which has been believed everywhere, always, by all."

Charles Heurtley introduced the Commonitory, in his translation, as Vincent's personal reference to "distinguish Catholic truth from heresy" based on the authority of Holy Scripture by which "all questions must be tried in the first instance" and "supplemented by an appeal to that sense of Holy Scripture which is supported by universality, antiquity, and consent."

Khalid Sheikh Mohammed (born 14 April 1965; Urdu: خالد شیخ محمد‎; sometimes also spelled Shaykh; and known by at least 50 pseudonyms including his initials KSM), is a Kuwaiti-born Pakistani terrorist, and the former head of propaganda for al-Qaeda. As of 2025, he is held by the United States at the Guantanamo Bay detention camp under terrorism-related charges. He was named as "the principal architect of the 9/11 attacks" in the 2004 9/11 Commission Report.

Mohammed was a member of Osama bin Laden's terrorist organization al-Qaeda, leading al-Qaeda's propaganda operations from around 1999 until late 2001. Mohammed was captured on 1 March 2003, in the Pakistani city of Rawalpindi by a combined operation of the U.S. Central Intelligence Agency (CIA) and Pakistan's Inter-Services Intelligence (ISI). Immediately after his capture, Mohammed was extraordinarily rendered to secret CIA prison sites in Afghanistan, then Poland, where he was interrogated and tortured by U.S. operatives. By December 2006, he had been transferred to military custody at Guantanamo Bay detention camp.

A trade name, also known as a trading name, business name or operating name, is a pseudonym used by companies and other organizations that do not operate under their registered legal name. Registering the trade name with a relevant government body is often required.