There seems some confusion over the family name Millett - Merrit and variations -
you can see from the 1851 census - the name is Merrett - by the time of the 1861 census the name is now Millett - who knows why the name changed? Transcription errors?
http://freepages.genealogy.rootsweb.com/~kayhin/51908h.html107 Grampound
Peter Merrett Head M 47 Labourer On Turnpike Roads Truro Cornwall
Mary Merrett Wife M 47 Mevagissey Cornwall
Susan Merrett Dau 12 At Home Truro Cornwall
Elizabeth A Merrett Dau 9 Scholar Grampound Cornwall
http://freepages.genealogy.rootsweb.com/~kayhin/61551.html13 1 Peter Millet Head M 55 Ag Lab St Clements Cornwall
Mary Millet Wife M 57 Mevagissey Cornwall
Elizabeth Millet Dau U 19 Grampound Cornwall
John Nancarrow Boardr U 24 Tanner Grampound Cornwall
Caroline Smith Dau M 30 St Clements Cornwall
Peter H Smith Grnson 6 Scholar Shoreditch Middlesex
Mary J Smith Grndau 2 Shoreditch Middlesex
John M Smith Grnson 8m Shoreditch Middlesex
later on the Millett name is preserved as a second given name by some family members ...