Andrewartha and Trewartha are Cornish family names.
Etymology Cornish NamesT. F. G. Dexter, Cornish Names, Royal Institution of Cornwall, 1926, Longmans Green. Reprinted 1968, Bradford Barton, p. 15 says: Nouns: "tre" a "town", feminine, maybe a hamlet or house "tref: village, town", Brythonic Celt Welsh about 4-500 AD Adjectives: "Wartha": "upper" (maybe higher or greater or on a hill) cf. "Wollas": "lower" (maybe smaller or lesser or in a valley, of the two). Definite article: "An" used as: "of the", "in the", "on the", "at the", in place names. Brythonic Celt Cornish language (Dexter, p. 18).
The book mentions "Trewartha" (p. 25), and "Andrewartha" (p. 60).
The Handbook of Cornish NamesG. Pawley White, A Handbook of Cornish Names, 1981. states: "Trewartha" is a Cornish name meaning "Upper Farm" or "Upper Homestead".
People Herbert Andrewartha (1907–1992), Australian research scientist in the fields of entomology, biology, zoology and animal ecology Janet Andrewartha (1951–2024), Australian actress John Andrewartha, Cornish-born American architect and civil engineer Roy Andrewartha, Welsh snooker player, finalist at the 1977, 1978, 1979 & 1984 World Snooker Championships Jake Andrewartha, Australian Olympian judoka, 2014 Commonwealth Games Medalist and professional wrestler
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