WikiWikiWeb was the first site to be called a wiki. Ward
Cunningham started developing WikiWikiWeb in 1994, and installed it
on the Internet domain c2.com on March 25, 1995. It was named by
Cunningham, who remembered a Honolulu International Airport counter
employee telling him to take the "Wiki Wiki" shuttle bus that runs
between the airport's terminals. According to Cunningham, "I chose
wiki-wiki as an alliterative substitute for 'quick' and thereby
avoided naming this stuff quick-web."
Source: http://en.wikipedia.org/wiki/Wiki#History