Family History and Genealogy Resources by Surname
Whitby Surname Origin
That is 'White-town,' or bay; a town in Yorkshire, England.
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.
Whitby Surname Meaning and Family Facts
There is more to Whitby family history than the origin of your surname:
A Whitby Family History Thought:
'The past isn't dead. It isn't even past.' --William Faulkner