Aage Birch
Aage Birch( 23 September 1926 – 13 February 2017) was a Danish competitive sailor and Olympic medalist.
He won a silver medal in the Dragon class at the 1968 Summer Olympics in Mexico City, together with Poul Lindemark- Jørgensen and Niels Markussen.
Evan James Williams
Evan James Williams FRS( 8 June 1903 – 29 September 1945) was a Welsh experimental physicist who worked in a number of fields with some of the most notable physicists of his day, including Patrick Blackett, Lawrence Bragg, Ernest Rutherford and Niels Bohr.
Williams earned a degree at Swansea University, doctorates at Manchester and Cambridge universities and a professorship at Aberystwyth University.
He was highly regarded by his colleagues, and made a Fellow of the Royal Society in 1939.
He died of cancer at the age of 42.
Ignacy Feliks Dobrzyński
Ignacy Feliks Dobrzyński (15 February 1807 – 9 October 1867) was a Polish pianist and composer.
He was the son of Ignacy Dobrzyński, the brother of Edward Dobrzyński, and the father of Bronisław Dobrzyński.
Niels Diffrient
Niels Diffrient (6 September 1928 – 8 June 2013) was an American industrial designer.
Diffrient focused mainly on ergonomic seating, and his most well known designs are the Freedom and Liberty chairs, manufactured by Humanscale.
Edward Dobrzyński
Edward Dobrzyński( died 21 November 1858) was a Polish musician, violinist, pianist and composer, the son of Ignacy Dobrzyński and the brother of Ignacy Feliks Dobrzyński.
He taught music in Kiev, and usually played piano accompaniment for travelling musicians and second violin parts at church.
David Ji
David Longfen Ji is an American businessman who co-founded Apex Digital, an electronics manufacturer.
In 2004, he was arrested in China following a dispute with Sichuan Changhong Electric, a supplier owned by the city of Mianyang and the province of Sichuan.
Changhong accused him of defrauding them through bad checks.
Ji was taken, according to an account by his lawyer, to the senior management and told, "I decide whether you live or die."
He has been held in China without charges.
Ji's case highlighted an "implicit racism" in dealings with American businessmen.
As a U.S. citizen he was not granted the same treatment by authorities as non-ethnically Chinese businessmen sharing the same nationality.
Bronisław Dobrzyński
Bronisław Dobrzyński was a Polish musician, pianist and composer.
He was the son of Ignacy Feliks Dobrzyński.
He arranged his father's Symphony No. 2 for piano 4- hands and composed several minor pieces.
He is most known for his book on his father's life and work(" Ignacy Dobrzyński w zakresie działalności dążącej do postępu muzyki w współczesnej jemu epoce".
Warszawa:[ s.n.], 1893).
Victor Weisskopf
Victor Frederick "Viki" Weisskopf (September 19, 1908 – April 22, 2002) was an Austrian-born American theoretical physicist.
He did postdoctoral work with Werner Heisenberg, Erwin Schrödinger, Wolfgang Pauli and Niels Bohr.
During World War II he was Group Leader of the Theoretical Division of the Manhattan Project at Los Alamos, and later campaigned against the proliferation of nuclear weapons.
Ignacy Dobrzyński
Ignacy Dobrzyński (2 February 1779 – 17 August 1841) was a Polish musician (violinist) and composer.
He was the father of Ignacy Feliks Dobrzyński and Edward Dobrzyński.
Paul Lindemark Jørgensen
Paul Lindemark Jørgensen( 29 July 1916 – 2 December 1988) was a Danish competitive sailor and Olympic medalist.
He was born in Copenhagen.
He won a silver medal in the Dragon class at the 1968 Summer Olympics in Mexico City, together with Aage Birch and Niels Markussen.

Question: Were Ignacy Feliks Dobrzyński and Niels Diffrient of the same nationality?
Answer: no