The Free On-line Dictionary of Computing (30 December 2018):

Windows NT 3.1

    Microsoft's first version of Windows
   NT, released in September 1993, price UKP 395, after having
   been in beta-test for as long as anyone could remember.

   The person responsible for VMS on the DEC VAX [who?] was
   also responsible for Windows NT.  Incrementing each letter in
   VMS yields WNT.

   (http://win2000mag.com/Articles/Index.cfm?ArticleID=4494).

   (2000-08-12)