Identifying the last native speaker of the Cornish language was a subject of academic interest in the 18th and 19th centuries, and continues to be a subject of interest today. The traditional view that Dolly Pentreath (1692–1777) was the last native speaker of the language has been challenged by records of other candidates for the last native speaker, and additionally there are records of others who had knowledge of the language at a later date, while not being native speakers.

Finding the last speaker of the language is complicated by the lack of audio recordings or transcriptions owing to the date of the language extinction. It is very difficult to know, without such evidence, whether those reported as speaking Cornish into the 19th century were able to speak the language fluently, or even whether they were speaking it at all. A substratum of Cornish vocabulary persisted in Cornish English, and in some cases those identified as Cornish speakers may have been speaking English with heavy Cornish influence.

Nevertheless, the difficulty of identifying the last speaker has not prevented academics spending considerable effort on the topic.

History

It will probably be impossible to establish who the definitive "last native speaker" of Cornish was owing to the lack of extensive research done at the time and the obvious impossibility of finding audio recordings dating from the era. There is also difficulty with what exactly is meant by "last native speaker", as this has been interpreted in differing ways. Some scholars prefer to use terms such as "last monoglot speaker", to refer to a person whose only language was Cornish, "last native speaker", to refer to a person who may have been bilingual in both English and Cornish and furthermore, "last person with traditional knowledge", that is to say someone who had some knowledge of Cornish that had been handed down, but who had not studied the language per se.

The last known monoglot Cornish speaker is believed to have been Chesten Marchant, who died in 1676 at Gwithian. It is not known when she was born. William Scawen, writing in the 1680s, states that Marchant had a "slight" understanding of English and had been married twice.Ellis, P. B. (1974) The Cornish Language. London: Routledge; p. 80

18th century

In 1742, Captain Samuel Barrington of the Royal Navy made a voyage to Brittany, taking with him a Cornish sailor of Mount's Bay. He was astonished that this sailor could make himself understood to Breton speakers. In 1768, Barrington's brother, Daines Barrington, searched for speakers of the Cornish language and at Mousehole found Dolly Pentreath, a fish seller of 76 years of age, who "could speak Cornish very fluently". In 1775, he published an account of her in the Society of Antiquaries of London's journal Archaeologia, entitled "On the Expiration of the Cornish Language". He reported that he had also found at Mousehole two other women, some ten or twelve years younger than Pentreath, who could not speak Cornish readily, but who understood it.Peter Berresford Ellis, The Cornish Language and its Literature, pp. 115–116 online Pentreath, who died in 1777, is popularly claimed to be the last native speaker of Cornish. Notwithstanding her customary words, "My ny vynnav kewsel Sowsnek!" ("I will not speak English!"), when addressed in that language, she spoke at least some English. After her death, Barrington received a letter, written in Cornish and accompanied by an English translation, from a fisherman in Mousehole named William Bodinar (also spelt Bodinnar and Bodener) stating that he knew of five people who could speak Cornish in that village alone. Barrington also speaks of a John Nancarrow from Marazion who was a native speaker and survived into the 1790s.Ellis, P. Berresford, The Story of the Cornish Language (Truro: Tor Mark Press, 1971)Ellis, P. Berresford (1974) The Cornish Language and its Literature. London: Routledge & Kegan Paul In 1797 a Mousehole fisherman told Richard Polwhele (1760–1838) that William Bodinar "used to talk with her for hours together in Cornish; that their conversation was understood by scarcely any one of the place; that both Dolly and himself could talk in English".Richard Polwhele, The History of Cornwall, 7 volumes, 1803–1808; vol. 5, pp. 19–20

Peter Berresford Ellis poses the question of who was the last speaker of the language, and replies that "We shall never know, for a language does not die suddenly, snuffed out with one last remaining speaker... it lingers on for many years after it has ceased as a form of communication, many people still retaining enough knowledge from their childhood to embark on conversations..." He also notes that in 1777 John Nancarrow of Marazion (Cornish: Marghasyow), not yet forty, could speak the language, and that into the next century some Cornish people "retained a knowledge of the entire Lord's Prayer and Creed in the language".Ellis, Cornish Language, p. 125 online Both William Pryce, in his Archaeologia Cornu-Britannica (1790), and John Whitaker, vicar of Ruan Lanihorne, in his Supplement to Polwhele's History of Cornwall (1799), mention two or three people, known to them, able to speak Cornish. Whitaker tells us that, after advertising money for Cornish, he was referred to a man at St Levan who would be able to give him "as many words of Cornish as I would choose to purchase." He failed to go to St Levan, or to Newlyn where he had been told a woman still lived who spoke Cornish.Journal of the Royal Institution of Cornwall, New Series, Volume VII, Part 1, 1973, p. 81 Polwhele himself mentions in his History of Cornwall, vol. V (1806), an engineer from Truro called Thompson, whom he met in 1789. Thompson was the author of Dolly Pentreath's epitaph and is said to have known far more Cornish than she ever did.Michael Everson, Henry Jenner's Handbook of the Cornish Language, 2010

Arthur Boase (1698–1780), who came originally from the parish of Paul, is known as a speaker of Cornish language having taught his children, including the banker and author Henry Boase, the numerals, Lord's Prayer and many phrases and proverbs in that language.Journal of the Royal Institution of Cornwall, New Series, Volume VII, Part 1, 1973, p. 82

There are two quotes from the 1790s about tin miners from the Falmouth area speaking an unknown language that nobody else understood. In 1793, John Gaze, master's mate to Captain Edward Pellew, on receipt of 80 tin miners from Falmouth for the ship Nymphe, stated "they struck terror wherever they went and seemed like an irruption of barbarians, dressed in the mud-stained smock-frocks and trowsers in which they worked underground, all armed with large clubs and speaking an uncouth jargon (Cornish) which none but themselves could understand." In 1795 James Silk Buckingham, of Flushing, noted "...the arrival one day of a band of three hundred or four hundred tinners ... and speaking an uncouth jargon which none but themselves could understand...". These men were ferried back to Falmouth on the boats that had brought them.A. K. Hamilton Jenkin, Cornwall and its People, 1946 ed., p. 371 The closest area from which such a large number of miners might have come was St Day and Carharrack, but they may have come from the area around Breage. If this "uncouth jargon" was Cornish it would mean that there were still a lot of people using it at the end of the 18th century.

19th century The Reverend John Bannister stated in 1871 that "The close of the 18th century witnessed the final extinction, as spoken language, of the old Celtic vernacular of Cornwall".John Bannister, Cornish Place Names (1871) However, there is some evidence that Cornish continued, albeit in limited usage by a handful of speakers, through the late 19th century. Matthias Wallis of St Buryan certified to Prince Louis Lucien Bonaparte in 1859 that his grandmother, Ann Wallis, née Rowe (c. 1753–1843), had "spoken in my hearing the Cornish Language well. She died about 15 years ago and she was in her 90th year of age. Jane Barnicoate died 2 years ago and she could speak Cornish too."Journal of the Royal Institution of Cornwall, New Series, Volume VII, Part 2, 1974, p.174Alan M. Kent, Tim Saunders, Looking at the Mermaid: a Reader in Cornish Literature 900–1900, Francis Boutle, 2000

The Rev. Edmund Harvey (born 1828) wrote in his history of Mullion that "I remember as a child myself being taught by tradition, orally of course, to count, and say the Lord's Prayer in Cornish, and I dare say there is many a youngster in Newlyn at the present moment who can score in Cornish as readily as he can in English."E. G. HARVEY, Mullyon. Truro: Lake, 1875.

J.M. Doble of Penzance noted in 1878 "Jaky Kelynack remembered, about 70 years ago, that the Breton fishermen and the old Cornishman could converse in their respective languages, and understood one another."Journal of the Royal Institution of Cornwall, New Series, Volume VII, Part 1, 1973, p.77 Charles Sandoe Gilbert noted in 1817 that a William Matthews of Newlyn, who had died thirty years previously, had been much more fluent than Dolly Pentreath. His son, also called William and died in Newlyn in 1800, was described as being "also well acquainted" with Cornish.Journal of the Royal Institution of Cornwall, New Series, Volume VII, Part 1, 1973, p.79 Letters from West Cornwall, a book written anonymously in 1826, records that "About two years ago when I visited the Land's End, I saw a blind boy who pretended to tell the numbers and a few phrases in Cornish, which he said he had learned from an old woman, since dead."Journal of the Royal Institution of Cornwall, New Series, Volume VII, Part 1, 1973, p.80

Barclay Fox recorded in his journal for 23 October 1838: Trudged to Penjerrick. Called at Tregedna. Mary Louise & Ellen left the room and returned with the most uncouth looking black rascally chimney sweepers I ever saw – old hats, coats breeches & boots, with their faces & hands blacked to the hue of ink. Such a pair as I wouldn't meet in a dark lane for something. They sat on the sofa and conversed in Cornish."Barclay Fox's Journal. Edited by RL Brett. Nance recorded that a couple living at Budock in the 1880s were often heard to converse in a strange tongue, which it was thought might have been Cornish.Journal of the Royal Institution of Cornwall, New Series, Volume VII, Part 1, 1973, p.76

In 1859, the linguist Edwin Norris reported that an old man had recited for him the Lord's Prayer and part of the Creed which had been taught to him by his father or grandfather.