Trevithick ( ) is a
Cornish language surname. Notable people with the surname include:
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Francis Trevithick (1812–1877), one of the first locomotive engineers of the London and North Western Railway
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Jonathan Trevethick (1864–1939), New Zealand politician
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Paul Trevithick (born 1959), United States inventor, engineer and entrepreneur
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Richard Trevithick (1771–1833), British inventor, mining engineer and builder of the first working railway steam locomotive
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William Edward Trevithick (1899–1958), Irish botanical illustrator