From the IGI (extracted entries):
William Davey TRAVIS age 31 (father George) m Alice Woolcock SMYTH age 21 (father Joseph), 15 Feb 1842 Saint Gluvias Cornwall England
William Davy TRAVIS bap 29 Dec 1805, Saint Gluvias Cornwall England, parents George TRAVIS & Joanna
George & Joanna also had (same place):
John 1792
George 1794
Mary Ann 1796
George 1798
Joseph 1801
then
William Davy 1805
Also perhaps relevant:
Alice SMITH b 1819, bap 11 Jun 1821 Saint Stephen in Brannel, Cornwall England, parents Joseph SMITH & Mary.
JAP