Hi Martha,
Interesting that you have an interest in these names in Camborne. Are you familiar with the wonderful online site
http://freepages.genealogy.rootsweb.com/~camborneopc that has many transcribed church records for the parish?
We must be distantly related as I have a 5greatgrandmother, Jenefer VIVIAN, who married Thomas YEATS in Camborne in 1812 as well as a 6greatgrandmother, Mary TEMBY, who married Christopher PASCO in Camborne in 1773.
Also, many of the Cornish censuses are transcribed at
http://freepages.genealogy.rootsweb.com/~kayhin/cocp.html and you'll find lots of VIVIANs and TEMBYs in the Camborne vicinity.
Good luck,
Karen in Pennsylvania