Named after Emil Theodor Kocher - Swiss surgeon, Nobel Prize winner 1909 (1841-1917).
Kocher is a lunar impact crater located on the lunar far side near the southern pole. The crater is located Southeast of the Ashbrook and Drygalski craters. (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.