se'-zar (Kaisar):

Originally the surname of the Julian gens (thus, Caius Julius Caesar); afterward a name borne by the Roman emperors. In the New Testament the name is definitely applied to Augustus (Luke 2:1, "Caesar Augustus"), to whom it belonged by adoption, and to Tiberius (Luke 3:1, "Tiberius Caesar"; compare Matthew 22:17,21). The "Caesar" to whom Paul appealed (Acts 25:11,12,21) was Nero. The form is perpetuated in "Kaiser" and "Czar."

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'CAESAR'". "International Standard Bible Encyclopedia". 1915.