Latin spelling for Greek mythological hero Heracles.
Hercules is a prominent crater located in the northeast part , to the west of the crater Atlas. It lies along the east edge of a southward extension in the Mare Frigoris. To the west across the mare is Bürg. To the south is the ruined crater Williams. (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.