Kosak Family History
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Kosak Name Meaning
Czech and Slovak (Kosák): from a diminutive of Kos or Kosa. Slovenian (Košak): nickname from a simplified form of košcak, denoting a kind of nut tree with very hard nuts, probably denoting a strong, vigorous man. Also found as Košcak.
Source: Dictionary of American Family Names ©2013, Oxford University Press