Alan K. Campbell
Alan K. Campbell( May 31, 1923 – February 4, 1998) was the first Director of the United States Office of Personnel Management.
Alan Campbell (Gaelic footballer)
Alan Campbell( born 9 October 1991) is an Irish Gaelic football player who plays at inter-county level for Tipperary, and plays his club football for Moyle Rovers.
Stephen King (Gaelic footballer)
Stephen King is a former Gaelic footballer for Cavan.
Pat Roe
Pat Roe is Gaelic footballer.
Conal Dunne
Conal Dunne is a Gaelic footballer.
Alan Pentland
George Alan Campbell Pentland (3 October 1883 – 15 December 1952) was an Australian rules footballer who played with South Melbourne in the Victorian Football League (VFL).
Martin Kližan
Martin Kližan( born 11 July 1989) is a Slovak professional tennis player.
Winner of the boys' singles title at the French Open in 2006, Kližan turned pro in 2007 and has a career- high singles ranking of world No. 24, achieved in April 2015.
Alan Campbell (writer)
Alan Campbell( born 7 July 1971) is a Scottish fantasy novelist.
Alan Campbell (rower)
Alan Campbell( born 9 May 1983) is a British sculler.
Alan Campbell (actor)
Bruce Alan Campbell (born April 22, 1957), credited professionally as Alan Campbell, was an American actor who was best known for his roles as Derek Mitchell in the 1987–1992 CBS series "Jake and the Fatman" and as E.Z. Taylor on the short-lived 1984–1985 "Three's Company" spin-off "Three's a Crowd".

Question: Were Martin Kližan and Alan Campbell (Gaelic Footballer) of the same nationality?
Answer: no