Named after Ernst Debes - German cartographer (1840-1923).
Debes is a lunar crater that is located to the north of the Mare Crisium, in the eastern part 's near side. It lies just to the northwest of the crater Tralles and the prominent Cleomedes. This crater is joined to the oval-shaped Debes A through a break in the southern rim. The later crater is joined along its western rim by Debes B, so that the result is a triple-crater formation. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.