While in Chicago Richard Speck stayed at a number of seedy flophouses, but his favorite was the St. Elmo Hotel because it housed Pete's Tap House, his preferred drinking hole.
The St. Elmo was named for Saint Elmo, the patron saint of sailors, who feature prominently in the backstory of the Speck mass murders (as well as certain saints). Saint Elmo, also known as Saint Erasmus of Formia, was martyred for his support of Christianity in the year 303, which references a powerful number 33. This number reappears in the crime narrative.
Dr. H.H. Holmes, America's first serial killer, was fond of another Saint Elmo Hotel, this one in Fort Worth, Texas, and he purchased it in 1894 in the hopes of refurbishing the place. It was a goal that went unfulfilled, as he was hanged for his crimes in 1896. He claimed to have killed between 20 and 200 women, obviously struggling to keep track of his evil deeds.
Saint Elmo is also the name of a clandestine society of Yale University - a member of the "consortium of eight" - that began its first initiation of eight female members in November 1966 (11/66), four months after the mass murder of eight student nurses.
Read more about odd coincidences - or correspondences - in the riveting investigatory work Richard Speck and the Eight Nurses: Deconstructing A Mass Murder, available at all online retailers.