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

basename

    The name of a file which, in contrast to a
   pathname, does not mention any of the directories
   containing the file.  Examples:

   	pathname	basename
   	--------	--------
   	/etc/hosts	hosts
   	./alma		alma
   	korte/a.a	a.a
   	a.a		a.a

   See also pathname.

   (1996-11-23)