German: from Middle High German keiser ‘emperor’, from
the Latin imperial title Caesar. This was the title borne by
Holy Roman Emperors from Otto I (962) to Francis II (who relinquished
the title in 1806). Later, it was borne by the monarch of Bismarck’s
united Germany (1871–1918). It is very common as a German surname,
originating partly as an occupational name for a servant in the
Emperor’s household, partly as a nickname for someone who behaved in
an imperious manner, and partly from a house sign.
Jewish
(Ashkenazic): ornamental name from German Kaiser ‘emperor’,
adopted (like Graf, Herzog, etc.) because of its
aristocratic connotations.
Muslim: from Arabic
qay?sar ‘emperor’, which, like 1, is of Latin origin, from
the imperial title in the Roman Empire.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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