John Marvin Jones
John Marvin Jones( February 26, 1882 – March 4, 1976) was a United States Representative from Texas and a Judge of the United States Court of Claims.
John M. LeVoir
John Marvin LeVoir( born February 7, 1946) is an American prelate if the Roman Catholic Church who serves as the Bishop of New Ulm, Minnesota.
Marc van Uhm
General Marc van Uhm is a two-star general in the Royal Netherlands Army and served as its deputy commander.
Marc van Orsouw
Marc van Orsouw( born 12 April 1964) is a former Dutch racing cyclist.
He rode in eight Grand Tours between 1986 and 1994.
Marc van Belkum
Marc van Belkum( born January 27, 1965 in Leiden) is a former water polo player from the Netherlands, who finished in ninth position with the Dutch team at the 1992 Summer Olympics in Barcelona.
Marc van Eijk
Marc van Eijk( born 5 November 1981) in Paramaribo is a retired Dutch football player and manager.
He is currently coach for the CRKSV Jong Holland in Curaçao.
Peter van Uhm
Petrus Johannes Mathias" Peter" van Uhm( born 15 June 1955) is a retired Royal Netherlands Army general.
He served as Chief of Defence of the Armed forces of the Netherlands from 17 April 2008 until 28 June 2012.
He previously served as the Commander of the Royal Netherlands Army from 5 September 2005 until 13 March 2008.
John Marvin (boxer)
John Marvin is an English- Filipino amateur boxer who is a native of the Isle of Wight in England.
He has represented the Philippines in boxing internationally.
Marc Van De Weghe
Marc Van De Weghe( born 9 May 1964) is a Belgian swimmer.
He competed in two events at the 1984 Summer Olympics.
John Marvin (sailor)
John Marvin (October 17, 1927 – June 22, 1980) was an American competitive sailor and Olympic medalist.
He is a 1949 graduate of the Massachusetts Institute of Technology and won a bronze medal in the Finn class at the 1956 Summer Olympics in Melbourne.

Question: Were John Marvin (Sailor) and Marc Van Uhm of the same nationality?
Answer: no