KANcycling is short for "KANSAI cycling," Kansai being the western part of Honshu which includes Kyoto, Nara, Osaka and Kobe. However, this site includes routes throughout the country, not just those in the Kansai.
The name KANcycling was chosen because
(a) it's where both the site and its creator reside,
(b) the name worked well in Japanese, and
(c) it just seemed to be a more interesting title than something generic like "Cycling Japan." :-)