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Last name Kostic (Kostic , Kostić , Костич ) , in the entire world, is a common cognomen. The cognomen Kostic is characteristic of Southern Europe, particularly Serbia, where it is a widespread surname, Montenegro, where it is a common surname, and Bosnia and Herzegovina, where it is quite a common surname (explore the name in all countries). Very seldom, Kostic is the forename as well as the last name.