The name is considered to have originated from Densu and Tenshu, or also to have been given by religious thought such as Buddhistic thought or by a corruption of Tenshu (Deus, which means Zeus) of Christianity.
名前の起こりは殿主、殿守から由来するか、仏教思想やキリスト教の天主（でうす、ゼウスのこと）の訛ったものなどの宗教思想からの命名とも考えられている。