The first part of the hill's name is a common
Brythonic element meaning "breast, pap; hill-side, slope, breast (of hill)", which is frequent in Welsh placenames. The Cornish historian and language expert
Henry Jenner suggested that the name came from a corruption of the Cornish words
bronn ughella/ewhella meaning "highest hill", as it is the highest point of Bodmin Moor and of Cornwall. The highest hill in
Devon has the similar name,
High Willhays which falls in line with this theory. In 1988, toponymist
Oliver Padel has put forward the alternative suggestion, that he suggests, could be from 'Bronn Wennili' which translates as 'Hill of Swallows'. The name has evolved through a variety of historical spellings as follows: Brunwenely c.1200, 1239; Brown Wenely 1239; Brenwenelyn 1276; Bronwenely, Brunwely 1280; Brounwenely 1350, 1362; Broun Welyn 1386; Brounwenyly 1401; Brownwenelegh 1450, 1470; Brounwellye, Bronwelly 1576; Brown-wellye 1584; Brounwellie 1639; Menar Brownuello 1754. It has frequently been noted on lists of
unusual place names. In 2012 a campaign was launched to have the hill's name restored to the original
Bronn Wennili on the grounds that it would be "slightly more attractive to residents and tourists than Brown Willy". Cornish residents objected to the idea. One commented: "It's been Brown Willy for as far back as living memory goes and I suspect, as others have pointed out, that it will always be called that, whatever name we may formally give it."
The Daily Telegraph ran an editorial supporting the existing name and called for campaigners to keep their "hands off Brown Willy". == Geography and geology ==