First found in Wigtown, where they held a family seat from very early times. This distinguished clan was originally known as the Clan MacKilhaffy and were seated at Craig Caffe in the parish of Inch.

To escape the uncertainties and discrimination faced in Scotland, many decided to head out for North America. Once they arrived, many Scots fought with relish in the American War of Independence; some went north to Canada as United Empire Loyalists. Many ancestors of these Scots have recovered their lost national heritage in the 20th century through clan organizations and Scottish historical societies. Among the settlers to North America were: Martin and Martha Mahaffy and their daughter Mary who settled in Charles Town [Charleston], South Carolina in 1767; Mary Mahaffy arrived in New York state in 1847.

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