Cosic

Cosic is a surname of South Slavic origin, commonly found among populations from the Balkans, particularly in Croatia, Bosnia and Herzegovina, Serbia, and Montenegro. In diacritics, the name is usually written Košić; in Anglicized or international contexts it often appears as Cosic or Kosic, reflecting transliteration without diacritics. The surname is patronymic in character, built with the suffix -ić, which denotes “son of” or “descendant of.” The root preceding the suffix is typically derived from a given name or nickname; therefore Cosic likely originated as a surname indicating lineage from a person with a root such as Koš– or similar. The precise origin can vary by family and region.

Cosic is also found among diaspora communities across North America, Western Europe, and Australia, where Balkan immigration in the 20th century led to its distribution beyond the native lands. Variants include Košić (with diacritics), Košic, and Kosic, depending on language and orthographic conventions.

Notable bearers of the surname have been active in a range of fields, including sports, academia, and the arts, reflecting the broad geographic distribution of the name. The name Cosic should be distinguished from similarly spelled surnames in other languages, and is primarily associated with South Slavic heritage.