Named after George Gamow - American physicist (1904-1968).
Gamow is a large lunar crater on the far side. It is located in the northern hemisphere, to the southeast of the walled plain Schwarzschild. This is a worn and eroded feature, with a rim that has been battered and overlain by multiple impacts. Gamow V is attached to the western exterior, and the joined crater pair Gamow A and Gamow B overlie the northeastern side. (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.