John Hayes (painter)
John Hayes( 1786? – 1866) was a British portrait- painter.
He died aged 80.
John Hayes (tennis)
John Hayes( born April 7, 1955) is a former professional tennis player from the United States.
Mario Jann
Mario Jann( born January 6, 1980) is a German professional ice hockey player.
He is currently playing for EHC München in the Deutsche Eishockey Liga( DEL).
John Hayes (director)
John Hayes( March 1, 1930 – August 21, 2000) was an American film director, producer, screenwriter, and actor.
Hayes is best known for directing low- budget B-movie features and later, exploitation films.
John Hayes (footballer, born 1936)
John Hayes( born 27 February 1936) is a former Australian rules footballer who played with St Kilda in the Victorian Football League( VFL).
John F. Hayes (Kansas legislator)
John F. Hayes( December 11, 1919 – January 14, 2010) was a Kansas attorney and former majority leader of the Kansas House of Representatives.
John F. Hayes (Borough President of Brooklyn)
John F. Hayes( 1915, Brooklyn, New York – 3 January 2001, Manhattan) was an American politician who served as the Borough President of Brooklyn in 1961.
Jackie Hayes (catcher)
John J. Hayes( June 27, 1861 – April 25, 1905) was an American Major League Baseball player from Brooklyn, New York, who split most of his playing time between catcher and in center field.
John Hayes (sailor)
John Hayes (20 July 1832 - 28 January 1911) was a veteran of the American Civil War and a recipient of the Medal of Honor.
John P. Hayes
John Patrick Hayes is an Irish-American computer scientist and electrical engineer, the Claude E. Shannon Chair of Engineering Science at the University of Michigan.

Question: Does Mario Jann have the same nationality as John P. Hayes?
Answer: no