1. 
   Ermak
   (from the article `Makarov, Stepan Osipovich`) ...ships intended exclusively for that purpose. His armour-piercing shells, known as Makarov tips, greatly increased the penetrating force of shells. ...
   Found op http://www.britannica.com/eb/a-z/e/41
   
   
2. 
   Ermak
   Ermak: see Yermak.
   Found op http://www.infoplease.com/ce6/people/A0913150.html
   
   
3. 
   Ermak
   Ermak is a cultivated variety of potato.
   Found op http://www.probertencyclopaedia.com/browse/QE.HTM
   
   

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