Named after Philip Fox - American astronomer (1878-1944).
Fox is a small lunar crater on the far side. This crater is bowl-shaped, with a roughly circular rim, simple sloping walls and a level, featureless interior. There is some talus along the northern inner wall. (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.