The term is an allusion on military nomenclature: Mark I, Mark VIII, etc.
Mark Twain | Henry VIII of England | Henry VIII | Mark | Edward VIII | Mark Wahlberg | Mark Knopfler | Mark Zuckerberg | Mark Rothko | Mark Antony | Mark the Evangelist | Gospel of Mark | Pope Urban VIII | Mark Ronson | Pope Clement VIII | Mark Spitz | Mark Foley | Charles VIII of France | Mark Murphy (singer) | Mark Murphy | Mark McGwire | Mark Hamill | Deutsche Mark | Mark Taper Forum | Mark Millar | Mark Lewisohn | Mark Kermode | The Six Wives of Henry VIII | Mark Lanegan | Mark Waugh |