Mary Catherine McIntire Pacheco
Mary Catherine McIntire Pacheco( January 22, 1842 — November 5, 1913) was an American writer and playwright.
She was also a diplomat's wife, and was First Lady of California during her husband's term in 1875.
Mary Clancy
Mary Catherine Clancy( born 13 January 1948) is a former Canadian politician and lawyer.
She was the Member of Parliament representing Halifax from 1988 to 1997.
Mary Catherine Bolton
Mary Catherine Bolton, later known by her married name of Lady Thurlow( 1790/91—1830) was a notable English actress, remembered particularly for playing Ophelia.
Catherine Small Long
Mary Catherine Small Long (born Mary Catherine Small; February 7, 1924 – November 23, 2019) was an American politician who served as the U.S. representative for Louisiana's 8th congressional district, which she filled from 1985 to 1987, the remainder of the term left by the death of her husband, Gillis William Long.
Until it was disbanded in 1993, the 8th district was based in Central Louisiana about Alexandria.
She was the first female military veteran elected to Congress, having served as a WAVE in the United States Navy.
Taffy Nivert
Mary Catherine" Taffy" Nivert Danoff( born October 25, 1944, in Washington, D.C.) is an American songwriter and singer.
She is best known for being a member of the Starland Vocal Band.
Magnus Bäckstedt
Magnus Bäckstedt( born 30 January 1975) is a former Swedish professional road bicycle racer.
His most notable achievement in cycling is winning Paris – Roubaix in 2004.
Mary Catherine Tinney
Mary Tinney( 15 February 1924- 22 November 2006) was the Irish ambassador to Sweden from 1973 to 1978, and was Ireland's first female ambassador.
Sidney Farrar
Sidney Mary Catherine Anne Farrar( 17 April 1900- 1987) was a British settler in Kenya and the first woman elected to the Legislative Council of Kenya.
Mary Silber
Mary Catherine Silber is a professor in the Department of Statistics at the University of Chicago who works in bifurcation theory and pattern formation.
Mary Catherine Ferguson
Mary Catherine Guinness Ferguson( 1823–1905) was an author and biographer in Dublin, Ireland.

Question: Were Magnus Bäckstedt and Mary Catherine Tinney of the same nationality?
Answer: no