The surname Johnston is a habitational name, deriving in most cases from the place Johnston in Annandale, in Dumfriesshire, Scotland. There are other places in Scotland so called, including the city of Perth, which used to be known as St. John’s Toun, and some of these may also be sources of the surname. The name Johnston was brought to Ireland by Scottish settlers in the 16th and 17th Centuries and is mainly found in the northern province of Ulster. A notable bearer of the name Johnston is the Irish novelist Jennifer Johnston. Today there are approximately 130,000 bearers of the surname Johnston living in The United States.