Elvey is a lunar crater on the far side. It is located near the northern edge of the blanket of ejecta that surrounds the Mare Orientale impact basin. To the north is the smaller crater Nobel. This is a damaged crater with a rim that is only partly intact along the eastern 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.