If you're asking about the origins of it and 'patient zero', this is from Wikipedia

The norovirus was originally named the "Norwalk agent" after Norwalk, Ohio, in the United States, where an outbreak of acute gastroenteritis occurred among children at Bronson Elementary School in November 1968. In 1972, electron microscopy on stored human stool samples identified a virus, which was given the name "Norwalk virus". Numerous outbreaks with similar symptoms have been reported since. The cloning and sequencing of the Norwalk virus genome showed that these viruses have a genomic organization consistent with viruses belonging to the family Caliciviridae.[61] The name was shortened to "norovirus" after being identified in a number of outbreaks on cruise ships and receiving attention throughout the United States. The name "norovirus" (Norovirus for the genus) was approved by the International Committee on Taxonomy of Viruses (ICTV) in 2002.[62] In 2011, however, a press release and a newsletter[63] were published by ICTV, which strongly encourage the media, national health authorities and the scientific community to use the virus name Norwalk virus, rather than the genus name Norovirus, when referring to outbreaks of the disease. This was also a public response by ICTV to the request from an individual in Japan to rename the Norovirus genus because of the possibility of negative associations for people in Japan and elsewhere who have the family name "Noro". Before this position of ICTV was made public, ICTV consulted widely with members of the Caliciviridae Study Group and carefully discussed the case.
In addition to "Norwalk agent" and "Norwalk virus", the virus previously has been called "Norwalk-like virus", "small, round-structured viruses" (SRSVs), and "Snow Mountain virus".[64] Common names of the illness caused by noroviruses still in use include "winter vomiting disease",[65] "winter vomiting bug",[66][67] "viral gastroenteritis", and "acute nonbacterial gastroenteritis".[2] It also colloquially is known as "stomach flu", but this actually is a broad name that refers to gastric inflammation caused by a range of viruses and bacteria.