« Reply #1 on: Wednesday 29 June 22 21:53 BST (UK) »
you can search the baptism register via FamilySearch, some of it is very faded and damaged.
http://www.rootschat.com/links/01rns/I can see a baptism 17 November(?) 1662 for John son of John Nankivill but haven't spotted Elizabeth. She could be under one of the stains.

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