Kozak

* As a Ukrainian, Carpathian Rusyn, Polish, Czech, Slovak, and Hungarian surname, all from the noun Kozak (“Cossack”). Compare the variants Kazak, Kosack, Kosak, Kozack. * Also as a Polish and Czech surname, occupational surname for a goatherd, from koza (“nanny goat”). This is also found in Slovene and Serbo-Croatian, though probably influenced by the sense above. * Also as a Slovak and Czech surname, possibly from kozák (“kind of mushroom”). * As a Turkish surname, from kozak (“cone”) or its homonym meaning "shady place," from Ottoman Turkish قوزاق. * As a Jewish surname, from Yiddish קאָזאַק (kozak, “Cossack”), related to the first sense above.

来源：wiktionary