Kos, meaning "blackbird", is a Slavic surname. It is very common in Slovenia, Croatia, Poland, Ukraine, and the Czech Republic.
It is the 10th most common surname in Slovenia. Unlike many other Slovene surnames, Kos is found throughout the country, although it's more common in the central and eastern regions than in the west.
It is the third most common surname in the Zagreb County of Croatia.
People
Anatoliy Kos-Anatolsky (1909–1983), Ukrainian composer
Božo Kos (1931–2009), Slovenian illustrator, caricaturist and comics artist
Ćiril Kos (1919–2003), Croatian Catholic prelate
Gojmir Anton Kos (1896–1970), Slovenian painter
Janko Kos (born 1931), Slovenian literary historian
Joanna Kos-Krauze (born 1972), Polish filmmaker
Józef Kos (1900–2007), Polish war veteran
Károly Kós (1883–1977), Hungarian architect
Maja Kos (born 1968), Serbian synchronized swimmer
Mile Kos (1925–2014), Serbian footballer
Milko Kos (1892–1972), Slovenian historian
Monika Kos (born 1967), Australian journalist
Paul Kos (born 1942), American conceptual artist
René Kos (born 1955), Dutch cyclist
Rudolph Kos (born 1945), American priest
Stephen Kós (born 1959), New Zealand judge
Tomasz Kos (born 1974), Polish footballer
Vladimir Kos (1936–2017), Czech football player

