Question: What was the middle name of the owner of the Clermont Club?

Context paragraphs:
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):

Trident Television: Trident Television Limited was a British holding company with broadcasting interests.  Trident acquired Halas and Batchelor (well known for their cartoons), Scarborough Zoo, Windsor Safari Park, Trident Casinos, Playboy Club, Watts & Cory Scenery, Victoria Casino, The Clermont Club, as well as Trident Holdings (Australia Pty Ltd) and several other companies.

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.

The Mayfair Set: The Mayfair Set, subtitled Four Stories about the Rise of Business and the Decline of Political Power, is a BBC television documentary series by filmmaker Adam Curtis.  It looks at Britain's decline as a world power, the invention of asset stripping in the 1970s, and how buccaneer capitalists shaped the climate of the Thatcher years, focusing on the rise of Colonel David Stirling, Jim Slater, Sir James Goldsmith and Tiny Rowland—members of London's elite Clermont Club in the 1960s.  It won a BAFTA Award for Best Factual Series or Strand in 2000.

John Bingham, 7th Earl of Lucan: Richard John Bingham, 7th Earl of Lucan (18 December 1934 – disappeared 7 November 1974), commonly known as Lord Lucan, was a British peer suspected of murder who disappeared in 1974.  He was born into an Anglo-Irish aristocratic family in Marylebone, the eldest son of George Bingham, 6th Earl of Lucan, by his marriage to Kaitlin Dawson.  An evacuee during the Second World War, Lucan returned to attend Eton College, and then from 1953 to 1955 served with the Coldstream Guards in West Germany.  He developed a taste for gambling and, skilled at backgammon and bridge, became an early member of the Clermont Club.  Although his losses often exceeded his winnings, he left his job at a London-based merchant bank and became a professional gambler.  He was known as Lord Bingham during his father's earldom from April 1949 until January 1964.

Clermont Set: The Clermont Set was an exclusive group of rich British gamblers who met at the Clermont Club at 44 Berkeley Square, in London's fashionable Mayfair district now located at 27–28 Curzon Street and called Aspinall's.  It was the first London casino opened by John Aspinall after he received a gaming licence under Britain's new gambling law.  Clermont Club had become famous among British celebrities at once but Aspinall sold this club in 1972 to Playboy Enterprises; Playboy was forced to sell this club in 1982 when it lost its licence.

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:

John Aspinall (zoo owner): John Victor Aspinall (11 June 1926 – 29 June 2000) was an English zoo owner and gambling club host.  From middle class beginnings he used gambling to move to the centre of British high society in the 1960s.  He was born in Delhi during the British Raj, and was a citizen of the United Kingdom.

ASM Clermont Auvergne: Association Sportive Montferrandaise Clermont Auvergne (] ) is a French rugby union club from Clermont-Ferrand in Auvergne-Rhône-Alpes that currently competes in Top 14, the top level of the French league system.  Clermont is a two times french champions in 2009-10 and 2016-17.  The rugby section is a part of a multi-sport club called AS Montferrand, which was founded in 1911 and adopted that name in 1919.  Although the rugby section changed its name to the current ASM Clermont Auvergne in 2004, it is still frequently referred to as Montferrand both within and outside France.

Billy Hill (gangster): William "Billy" Charles Hill (13 December 1911 – 1 January 1984) was an English criminal, linked to smuggling, protection rackets, and extreme violence.  He was one of the foremost perpetrators of organised crime in London from the 1920s through to the 1960s.  He project managed cash robberies and, in a clever scam, defrauded London's High Society of millions at the card tables of John Aspinall's Clermont Club.

Supporting paragraphs: Billy Hill (gangster) John Aspinall (zoo owner)
Answer: Victor