Family History and Genealogy Resources by Surname
Tennison Surname Origin
From Tenesone, a place in Gottespunt or Cazdee, in Switzerland. If the name be not local, it is probably a corruption of Dennison.
Source: An Etymological Dictionary of Family and Christian Names With an Essay on their Derivation and Import; Arthur, William, M.A.; New York, NY: Sheldon, Blake, Bleeker & CO., 1857.
Tennison Surname Meaning and Family Facts
There is more to Tennison family history than the origin of your surname:
A Tennison Family History Thought:
'Genealogy: Tracing yourself back to people better than you are.' --John Garland Pollard