The name of Nihonji Daibutsu is Yakushirurikonyorai(薬師瑠璃光如来), and represent the entire the space is the pure land, and it leads the world to the peace and safe.
Daibutsu is located in Nihonji Temple which is the oldest Buddhism temple in Kanto built in 725. The name “Nihon” is the also the name of Japan and it has been given by the Emperor Syoumu(聖武天皇).