Named after Amil Kumar Das - Indian astronomer (1902-1961).
Das is a lunar impact crater on the far side. It is located to the northwest of the walled plain Chebyshev. To the southwest is the irregular crater Mariotte, and Von der Pahlen lies to the east-northeast. This crater has a sharp-edged rim that is not overlaid by any craters of note. (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.