Named after Johann Stöfler - German astronomer, mathematician (1452-1531).
Stöfler is a large lunar impact crater located in the crater-riddled southern highlands, named for Johannes Stöffler. It sits to the west of the crater Maurolycus. The distorted crater Fernelius is attached to the northern rim, and Miller and Nasireddin lie to the west. Faraday has overlain and damaged the western rim, and this crater in turn has been overlain by several smaller 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.