Named after Eugen Saenger - German rocketry scientist (1905-1964).
Saenger is an ancient lunar crater that lies on the far side , just beyond the eastern limb. To the west-northwest is the crater Erro, and due north lies Moiseev. To the northeast is Al-Khwarizmi. The outer rim has been eroded and reshaped by subsequent impacts, leaving the outer wall nearly destroyed to the north and south. (wikipedia entry)