Johann Haller
Johann Haller or Jan Haller( 1463 – 1525) is considered one of the first commercial printers in Poland.
Jan Janz Slop
Jan Janz Slop, or Jan Slob( 1643, Edam – 1727), was a Dutch Golden Age painter.
Jan Lagoor
Johan, or Jan Lagoor( 1620 – 1660), was a Dutch Golden Age painter.
Jan Patočka
Jan Patočka (1 June 1907 – 13 March 1977) was a Czech philosopher.
Due to his contributions to phenomenology and the philosophy of history he is considered one of the most important philosophers of the 20th century.
Having studied in Prague, Paris, Berlin and Freiburg, he was one of the last pupils of Edmund Husserl and Martin Heidegger.
During his studies in Freiburg he was also tutored by Eugen Fink, a relationship which eventually turned into a lifelong philosophical friendship.
Choi Yun-hui
Choi Yun- hui( born 1 September 1967) is a South Korean swimmer.
She competed in two events at the 1984 Summer Olympics.
Choi is the younger sister of Choi Yun -jung, who also competed internationally for South Korea in swimming.
The two were nicknamed the" Seal Sisters", and were noted for frequently both breaking national backstroke records at the same time.
Choi began learning to swim while in kindergarten through lessons at the YMCA.
Both sisters attended Seoul National University Middle School, and represented their school in swimming at the national level.
Following the 1984 Olympics, she won gold in the 100 m and 200 m backstroke at the 1986 Asian Games.
In 1987, she became the first South Korean model for the Japanese sports drink brand Pocari Sweat.
In 2017, she was named a board member of the Korean Sport& Olympic Committee.
Jan Luyken
Johannes or Jan Luyken( April 16, 1649 – April 5, 1712) was a Dutch poet, illustrator and engraver.
Johann Christian Kammsetzer
Johann Christian Kammsetzer or Jan Chrystian Kamsetzer( Dresden, 1753 – 25 November 1795, Warsaw) was a Dresden- born architect who was active primarily in Poland.
Choi Yun-suk
Choi Yun-suk( born 5 September 1979) is a South Korean speed skater.
She competed in the women's 1500 metres at the 2002 Winter Olympics.
Choi Yun-chil
Choi Yun-chil( born July 19, 1928) is a former South Korean long- distance runner who was a two- time Olympian and a two- time national champion in the marathon.
Choi led the marathon at the 1948 Summer Olympics in London before dropping out with less than 5 kilometers left in the race.
He finished third in the 1950 Boston Marathon, but the Boston Athletic Association denied his entry into the follow year's event.
During the height of the Korean War, BAA President Walter A. Brown stated:" While American soldiers are fighting and dying in Korea, every Korean should be fighting to protect his country instead of training for marathons.
As long as the war continues there, we positively will not accept Korean entries for our race on April 19."
In 1952, Choi would finish fourth in the Olympic marathon at Helsinki.
Jan Śleszyński
Ivan Sleshinsky or Jan Śleszyński( 23 July 1854 – 9 March 1931) was a Polish- Russian mathematician.
He was born in Lysianka, Russian Empire to Polish parents.

Question: Who was born earlier, Jan Patočka or Choi Yun-chil?
Answer: Jan Patočka