Named after Peder Horrebow - Danish astronomer (1679-1764).
Horrebow is a lunar impact crater that is located along the northern shore of Mare Frigoris, just to the south of the walled plain J. Herschel. To the west is the crater Robinson. Horrebow is roughly circular, but it has a narrower inner wall along the east and southeast sides than elsewhere around the perimeter. The inner walls have slumped, forming a ledge around the base of the slope. (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.