Family name Kotska (Kotska 
, Костка 
, Коцка ) , globally, is a rare cognomen. The cognomen Kotska is habitual in Estonia, where it is quite a rare surname, Ukraine, where it is a rare surname, and Belarus. In absolute terms, this name is the most popular in Ukraine, Russia, and Estonia. Much less frequently, Kotska is the forename as well as the last name.