The family derived its surname (which is pronounced "Trevillian") from Trevelyan in the parish of St Veep, Cornwall. The manor of Trevelyan was located in the ancient hundred of West Wivel, named Trewellen in the Domesday Book of 1086, which was mapped in the British Ordnance Survey of 1890 as located 0.9 miles east of Penpoll on the south side of the intersection of Route B3389 with an east-west road. A different manor named Trevelien in 1086 (now named Trevillyn) is in the adjacent hundred of Powder.
The Trevilian, later Trevelyan Baronetcy, of Nettlecombe in the County of Somerset, was created in the Baronetage of England on 24 January 1662 for George Trevilian. He was the son and namesake of George Trevilian, a member of the gentry and supporter of the Royalist cause in the Civil War. The second Baronet sat as Member of Parliament for Somerset and Minehead. He changed the spelling of the family surname to Trevelyan. The fourth Baronet was Member of Parliament for Newcastle-upon-Tyne and Somerset. The eighth Baronet served as High Sheriff of Cornwall from 1906 to 1907. As of 28 February 2014 the present Baronet has not successfully proven his succession and is therefore not on the Official Roll of the Baronetage, with the baronetcy considered dormant since 1976.
Four members of the main branch of the family may also be mentioned. The Venerable George Trevelyan, third son of the fourth Baronet, was Archdeacon of Taunton. His third son Henry Willoughby Trevelyan was a Major-General in the British Army. His younger son Sir Ernest John Trevelyan (1850–1929) was a Judge of the High Court of Calcutta, a writer on legal matters and a member of the Oxford Town Council. Humphrey Trevelyan, Baron Trevelyan, son of Reverend George Philip Trevelyan, son of the Reverend William Pitt Trevelyan, sixth son of the aforementioned the Venerable George Trevelyan, was a diplomat and author. See below.
The Trevelyan Baronetcy, of Wallington in the County of Northumberland, was created in the Baronetage of the United Kingdom on 13 March 1874 for the civil servant and colonial administrator Sir Charles Trevelyan, 1st Baronet. He was the son of the aforementioned the Venerable George Trevelyan, third son of the fourth Baronet of the 1662 creation (see above). The second Baronet was a prominent historian and Liberal politician. The third Baronet was a Liberal, and later Labour politician. The fourth Baronet was a teacher, craftsman in wood and New Age thinker. Three other members of this branch of the family may also be mentioned. R. C. Trevelyan, second son of the second Baronet, was a poet and dramatist. His son Julian Trevelyan was a painter. G. M. Trevelyan, third son of the second Baronet, was a distinguished historian. The family seat is Wallington Hall, near Cambo, Northumberland.
Trevilian, later Trevelyan baronets, of Nettlecombe (1662)
- Sir George Trevilian, 1st Baronet (c. 1635–1671)
- Sir John Trevelyan, 2nd Baronet (1670–1755)
- Sir George Trevelyan, 3rd Baronet (1707–1768)
- Sir John Trevelyan, 4th Baronet (1735–1828)
- Sir John Trevelyan, 5th Baronet (1761–1846)
- Sir Walter Calverley Trevelyan, 6th Baronet (1797–1879)
- Sir Alfred Wilson Trevelyan, 7th Baronet (1831–1891)
- Sir Walter John Trevelyan, 8th Baronet (1866–1931)
- Sir Willoughby John Trevelyan, 9th Baronet (1902–1976)
- Sir Norman Irving Trevelyan, 10th Baronet (1915–1996)
- Sir Edward Norman Trevelyan, 11th Baronet (born 1955)
The heir apparent is the present holder's only son Reed Edward Trevelyan (born 1996).
Trevelyan baronets, of Wallington (1874)
- Sir Charles Edward Trevelyan, 1st Baronet (1807–1886)
- Sir George Otto Trevelyan, 2nd Baronet (1838–1928)
- Sir Charles Philips Trevelyan, 3rd Baronet (1870–1958)
- Sir George Lowthian Trevelyan, 4th Baronet (1906–1996)
- Sir Geoffrey Washington Trevelyan, 5th Baronet (1920–2011)
- Sir Peter John Trevelyan, 6th Baronet (born 1948)
- A very British family: the Trevelyans and their world, by Laura Trevelyan. I.B.Tauris, 2006. ISBN 1-86064-946-7.
|This article needs additional citations for verification. (February 2013) (Learn how and when to remove this template message)|
- Official Roll of the Baronets. Standing Council of the Baronetage. 1997.
- Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990,[page needed]
- Lundy, Darryl. "FAQ". The Peerage.[unreliable source]
- Brief biography of Sir Ernest John Trevelyan
- This page incorporates information from Leigh Rayment's Baronetage Page([self-published source][better source needed]) which has further dates on it, not shown above.