Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
JOHNSTON
As described in historical dictionaries
Patronymica Britannica (1860)
JOHNSTON. JOHNSTONE. Posttowns and parishes in Dumfriesshire and Eenfrewshire. For a local surname this is exceedingly common, there being between sixty and seventy traders bearing it in Lond. Direct. It is often confounded with Johnson.
Surname type: Location or geographical feature
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic