This web site, started in May 2007, is dedicated to genealogical research of the Finnis family. It is the largest source of that information.
The main family depicted in this site is that of Anthony Graham Finnis (AGF), born 12 December 1941 but there were other families with the Finnis name in and around Dover during the 18th century. However, it has not been possible to establish a link to them. In the second half of the 19th century, there were at least two Finnis families around Bethnal Green, Hackney and Stepney in East London. Again, there is no link. Several of the streets where they lived were destroyed in World War 2 or were lost as part of the dockland development in London.
Nevertheless, there are many Finnis individuals in this site for whom no direct link has been found.
It could be said that the link from AGF, to Henry Finnis (born 1768) and Ann Knott (born 1774) is a little tenuous. Their son (another Henry born around 1803) does not appear as part of the family in some sources. However, the 1851 census shows that Henry, a policeman, had with him his nephew James aged 20 from East Langdon, (also a policeman). This strongly suggests that he was James the son of Thomas Finnis (1805) and the 1851 census for the household of Thomas shows that his son James was not there. Further corroboration comes from James having married in London in 1852.