« Reply #1 on: Thursday 15 May 14 19:04 BST (UK) »
well, there's only one instance of it on the OPC database, so doesn't look to be used much in Cornwall. Several instances of it on FreeBmd, with a fair spread of places in England & Wales, but only a couple in Cornwall. Seems to be used for males & females, but doesn't seem to be used before the 1850s. The height of Everest was first published in 1856, the Great Trignometric Survey of India had been measuring Himalyan peaks since 1847, so that could be the source of the name.

Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb