Family History and Genealogy Resources by Surname
Putnam Surname Origin
(Origin Dutch) From Put or Putten, a well, and ham, a house or town. Welltown, or the house by the well.
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.
Putnam Surname Meaning and Family Facts
There is more to Putnam family history than the origin of your surname:
A Putnam Family History Thought:
'The past isn't dead. It isn't even past.' --William Faulkner