Family History and Genealogy Resources by Surname
Ralston Surname Origin
Ralph, one of the descendants of Mac Duff, Thane of Fife, obtained a grant of land in Renfrewshire, and, as was common in those days, called he place after himself, Ralphstown, which was softened into Ralston.
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.
Ralston Surname Meaning and Family Facts
There is more to Ralston family history than the origin of your surname:
A Ralston Family History Thought:
Whenever there's a will, you'll see an heir loom.