The author offers the first complete English translation of the Old Khmer inscription K.557/600 from Angkor Borei, which dates from 611 CE. It is the earliest dated inscription of Cambodia known today. This source was first published by George Cœdès in 1942. He translated the inscription into French but omitted the names of servants. Since his edition there has been no attempt to produce the full translation, except the Russian translation by Anton O. Zakharov in 2016. The inscription sheds light on the ancient Khmer personal names and sobriquets. Namesofservants or ‘slaves,’ whowere granted to various gods, i.e. religious foundations, by various donators, were of Sanskrit, Old Khmer, Austronesian, and Austroasiatic origin. But servants who bore these names or sobriquets played similar social roles. Thus, names of different origin were not indicators of different social status.