Question: What is the middle name of the leader of Quantrill's Raiders?

Context paragraphs:
Jeff Strabone: Jeff Strabone is a Brooklyn-based American scholar, political activist and civic leader.  In 2016, his website "directelection.org" listed the names and addresses of members of the U.S. Electoral College, and he urged people to write to electors to ask them not to vote for president-elect Donald Trump, an effort which brought him national attention.  As a civic leader in Brooklyn, he has been active in promoting theatre preservation, building codes and housing issues, hospital preservation, and traffic flow.  He has been a leader of Brooklyn's Cobble Hill Association, a neighborhood preservation group.  He is the co-founder and chairman of the New Brooklyn Theatre.  In 2008, he changed his middle name to "Hussein" as a show of solidarity with then presidential candidate Barack Obama, who was running for the office of president, and who had been criticized for his Muslim-sounding middle name.  He is an associate professor of English and teaches British and African literature, and he was granted tenure at Connecticut College in 2016.  He commented about the post-election effort:

Quantrill's Raiders: Quantrill's Raiders were the best-known of the pro-Confederate partisan rangers ("bushwhackers") who fought in the American Civil War.  Their leader was William Quantrill and they included Jesse James and his brother Frank.

Marion Christopher Barry: Marion Christopher Barry was born in June 1980 to Marion Barry and Barry's third wife, Effi Slaughter Barry.  He was their only child.  His father had wanted to name him Marion Barry III, but Effi was strongly opposed, and they decided to give him the middle name Christopher instead.  For most of his adult life, Barry went by his middle name, Christopher.

Barend: Barend or (somewhat dated spelling) Barent is a Dutch male given name and occasional middle name.  As of 2014, there are over than 4,000 men in the Netherlands with this as their first name, and nearly 3,000 with it as their middle name.  It was likely derived from Bernard.  Notable people with the name include:

Singh: Singh is a title, middle name or surname, which originated in India.  Derived from the Sanskrit word for lion, it was adopted as a title by certain warrior castes in India.  It was mandated by Guru Gobind Singh for all Sikhs.  It was later adopted by several castes and communities.  As a surname or a middle name, it is now found throughout the Indian subcontinent and among the Indian diaspora, cutting across communities and religious groups, becoming more of a title than a surname.

William Quantrill: William Clarke Quantrill (July 31, 1837 – June 6, 1865) was a Confederate leader during the American Civil War.

Lawrence massacre: The Lawrence massacre, also known as Quantrill's raid, was an attack during the American Civil War (1861-1865) by the Quantrill's Raiders, a Confederate guerilla group led by William Quantrill, on the Unionist town of Lawrence, Kansas.

Middle name: In several cultures, people's names usually include one or more names in addition to the portion that is usually considered adequate to identify them.  In a number of cultures where a given name is expected to precede the surname, such a name is likely to be placed after the given name and before the surname, and thus called a middle name.  In English-speaking American culture, that term is often applied (arguably mistakenly) to names, occupying that position, even if the bearer would insist that that name is being mistakenly called a "middle name", and is actually (to mention several types of atypical cases):

Latvian name: Latvian names, like in most European cultures, consist of two main elements: the given name ("vārds") followed by family name ("uzvārds").  During the Soviet occupation (1940 - 1991) the practice of giving a middle name was discouraged, but since the restoration of Independence Latvian legislation again allows giving of up to two given names and it has become more common to give a middle name to children.

Skirmish at Albany, Missouri: The Skirmish at Albany, Missouri was a battle that was fought between the Union army and the Quantrill's Raiders in Gentey County, Missouri on October 26, 1864.  The battle resulted a Union victory and the notorious Quantrill Raider Member William T. Anderson also known as Bloody Bill, was killed at this battle.

Supporting paragraphs: Quantrill's Raiders William Quantrill
Answer: Clarke