What is "kossak"

Kossak is the surname of the 4 generations of notable Polish painters, writers and poets, descending from the historical painter Juliusz Kossak. The family includes:

• Progenitor, Juliusz Kossak (1824–99), Polish painter from the partitions period
• Wojciech Kossak (1857–1942), painter, son of Juliusz Kossak
• Jerzy Kossak (1886–1955), painter, son of Wojciech Kossak, grandson of Juliusz Kossak
• Zofia Kossak-Szczucka (1889–1968), novelist, daughter of Wojciech Kossak's twin brother Tadeusz Kossak, granddaughter of Juliusz Kossak
• Maria Pawlikowska-Jasnorzewska née Kossak (1891–1945), poet, second daughter of Wojciech Kossak, granddaughter of Juliusz Kossak
• Magdalena Samozwaniec née Kossak (1894–1972), writer, third daughter of Wojciech Kossak, granddaughter of Juliusz Kossak
• Gloria Kossak (1941–1991), painter and poet, daughter of Wojciech Kossak's son, Jerzy Kossak (1886–1955)

(as well as)

• Karol Kossak (1896–1975) – painter, illustrator
• Leon Kossak (1827–1877) – amateur painter
• Władysław Kossak (1828–1918) – painter, Polish émigré in Australia

Note: the above list of persons incorporates information available in Polish Wikipedia.