Ukrainian, Polish, Sorbian, Czech, Slovak (Kozák), and
Hungarian (Kozák): ethnic name for a Cossack, a member of a
people descended from a group of runaway serfs who set up a
semi-independent military republic in Ukraine in the 15th and 16th
centuries. The Cossacks became noted for their military prowess. The
word Cossack is of Turkic origin, but most European languages
borrowed it from eastern Slavic (Russian, Ukrainian kazák,
kozák). This term also came to be used as a nickname for a
pert fellow, a devil-may-care blusterer.
Polish
and Czech (Kozák): metonymic occupational name for a
goatherd, from a diminutive of Koza.
Jewish
(Ashkenazic): nickname from Yiddish kozak ‘warrior’, ‘brave
man’ (a Ukrainian loanword), a derivative of 1.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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