Family History and Genealogy Resources by Surname
Jack Surname Origin
The same as John.
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.
Jack Surname Meaning and Family Facts
There is more to Jack family history than the origin of your surname:
A Jack Family History Thought:
'Every man is his own ancestor, and every man his own heir. He devises his own future, and he inherits his own past.' -- H. F. Hedge