Named after William Harvey - British doctor (1578-1657).
Harvey is a lunar impact crater on the far side from the Earth. It lies astride the eastern rim of the much larger crater Mach, and the outer rampart extends part way across the interior floor. Some distance to the north is the crater Joule, and equally far to the east-southeast is Kekulé. The rim is mildly eroded, and a small craterlet lies in the western part of the interior floor. (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.