Named after John Tebbutt - Australian astronomer (1834-1916).
Tebbutt is a lunar crater that is located near the southwestern edge of Mare Crisium. It was formerly designated Picard G before being named by the IAU, and lies south of the crater Picard. To the north , but farther east than Picard, is the flooded Lick. This crater has a worn and damaged outer rim along its eastern half, but the rim is all but nonexistent on the western face, being little more than a pair of curved ridges beneath the surface. (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.