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Trevelyan is a Welsh and Cornish name derived from a place-name which originally meant "farmstead 'trev' or Tref (town in Welsh) of Elyan".

People with the surname

Anne-Marie Trevelyan (born 1969), British Conservative Party politician, Member of Parliament (MP) for Berwick upon Tweed since 2015
Sir Charles Trevelyan, 1st Baronet, 2nd creation (1807–1886), British civil servant
Sir Charles Trevelyan, 3rd Baronet, 2nd creation (1870–1958), British Member of Parliament
Francis Trevelyan Buckland (1826–1880), English surgeon, zoologist, popular author and natural historian
George Macaulay Trevelyan (1876–1962), British historian and university administrator
Sir George Trevelyan, 3rd Baronet, 1st creation (1707–1768)
Sir George Trevelyan, 2nd Baronet, 2nd creation (1838–1928), British statesman and historian, as George Otto Trevelyan
Sir George Trevelyan, 4th Baronet, 2nd creation (1906–1996), British new age spiritualist
Humphrey Trevelyan, Baron Trevelyan (1905–1985), British diplomat and author
John Trevelyan (disambiguation)
Julian Trevelyan (1910–1988), English artist and poet
Julian Trevelyan (pianist) (born 1998), British concert pianist
Laura Trevelyan (born 1968), BBC journalist
Mary Caroline Moorman (1905 - 1994) née Trevelyan, English historian
R. C. Trevelyan (1872–1951), English poet and translator
Raleigh Trevelyan (1923–2014), British author, editor and publisher
Robert Trevelyan (cricketer) (born 1970), English former first-class cricketer
Sir Walter Calverley Trevelyan, 6th Baronet, 1st creation (1797–1879)
Walter Trevelyan (1821–1894), English first-class cricketer and barrister

Alec Trevelyan, a character in the James Bond movie GoldenEye
Dr. Francis Trevelyan, a character in The Spy with a Cold Nose
Dr. Trevelyan, a character in "The Adventure of the Resident Patient" by Arthur Conan Doyle
Captain Trevelyan, a character in The Sittaford Mystery by Agatha Christie
Louis Trevelyan, a character in He Knew He Was Right by Anthony Trollope
Christian Trevelyan Grey, a character in Fifty Shades of Grey by EL James
Kurt Trevelyan, a character in Halo: Ghosts of Onyx by Eric Nylund
Trevelyan, a character who escaped the inundation of the sea when Lyonesse was engulfed
Inquisitor Trevelyan, a potential player character in Dragon Age: Inquisition
Colley Trevelyan, a character in "Sparrows in the Scullery" by Barbara Brooks Wallace
Armand Trevelyan, a character in Isaac Asimov's novella "Profession"
Maxim Trevelyan, character in The Mister by E. L. James.

Trevelyan Richards, coxswain of the RNLI lifeboat during the Penlee lifeboat disaster