Heinrich von Siebold
Heinrich Philipp von Siebold( July 21, 1852 – August 11, 1908) was a German antiquary, collector and translator in the service of the Austrian Embassy in Tokyo.
James McCray
James McCray was an American operatic tenor and voice teacher.
Philipp Franck
Johann Heinrich Philipp Franck( 9 April 1860, Frankfurt am Main- 13 March 1944, Berlin) was a German Impressionist painter, graphic artist and illustrator.
Ludwig Heinrich Philipp Döderlein
Ludwig Heinrich Philipp Döderlein( 3 March 1855, Bad Bergzabern – 23 April 1936, Munich) was a German zoologist.
He specialized in echinoderms, particularly sea stars, sea urchins, and crinoids.
He was one of the first European zoologists to have the opportunity to do research work in Japan from 1879 to 1881.
Today, he is considered one of the most important pioneers of marine biological research in Japan.
He was the director and curator of the Musée zoologique de la ville de Strasbourg from 1882 to 1919.
He headed the Zoologische Staatssammlung München from 1923 to 1927 and was Professor of Zoology in the Ludwig Maximilian University of Munich.
John Potter (musician)
John Potter is an English tenor and academic.
Friedrich Demmer (tenor)
Friedrich Demmer( 1785 – 15 April 1838) was an Austrian operatic tenor, actor and director and possibly the first Florestan in Beethoven's" Fidelio".
Heinrich Gaedcke
Ludwig Heinrich Gaedcke( 16 January 1905 – 21 December 1992) was a German general.
Ludwig Heinrich von Jakob
Ludwig Heinrich von Jakob( 26 February 1759 – 22 July 1827) was a German philosopher, political scientist and economist.
During the French occupation of Germany, he worked as a consultant and professor in Russia.
Ludwig Geyer
Ludwig Heinrich Christian Geyer( 21 January 1779 – 30 September 1821) was a German actor, playwright, and painter.
Prince William of Baden
Margrave Wilhelm of Baden( 8 April 1792 in Karlsruhe – 11 October 1859 in Karlsruhe) was the second son of Karl Friedrich, Grand Duke of Baden and his second wife, Luise Karoline, Baroness Geyer von Geyersberg( 26 May 1768 – 23 July 1820), the daughter of Lt. Col. Baron Ludwig Heinrich Philipp Geyer von Geyersberg and his wife, Countess Maximiliana Christiane of Sponeck.
Because his marriage to Luise was considered by the House of Baden as morganatic, Wilhelm, for a time, had no succession rights to the Grand Duchy.

Question: Do Ludwig Heinrich Philipp Döderlein and Friedrich Demmer (tenor) share the same nationality?
Answer: no