Back before the year 2000, calling something “2000” sounded futuristic, there was a trend of products being named “<product name> 2000” the same way they sometimes now are called “<product name> 3000”. 2001 was also the name of a popular science fiction movie and novel, adding to its appeal. Using 2001 sounded like science fiction because the idea of the third millennium still seemed futuristic even back then, only a year away from it.