This was told to me by Maud Kaljut: Estonians had only one name. The German landlords wanted Estonians to have family names. Some families had German names but a Kaljut ancestor-I do not know which one- looked in the Bible. He came across the passages describing "a house built upon rock-can weather storms". Kalju means "rock" in Estonian. The name was originally spelled "Kaljut" but some family members felt "Kaljot" was easier to pronounce for an Estonian.