From the Latin family name of the first Roman emperor, Gaius Julius
Caesar (100–44 bc), which gave rise to vocabulary words
meaning ‘emperor’ or ‘ruler’ in German (Kaiser), Russian
(tsar), Arabic (qay?sar), and other languages. As a
modern family name it is probably most often a humanistic
re-translation into Latin of German Kaiser, but it is also
found as an Americanized form of Italian Cesare and French
César and Césaire. It is also found as an English
surname, derived either from a medieval personal name taken from the
Latin or a nickname for someone who had played the part of the emperor
Julius Caesar in a pageant.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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