Family History and Genealogy Resources by Surname
Johnston Surname Origin
(Origin Scottish) habitational (locational) name, deriving in most cases from the place so called in Annandale, in Dumfriesshire. This is derived from the genitive case of the personal name John + Middle English tone, toun ‘settlement’
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.
Johnston Surname Meaning and Family Facts
There is more to Johnston family history than the origin of your surname:
A Johnston Family History Thought:
'The past isn't dead. It isn't even past.' --William Faulkner