First found in Knoydart, where they were a sept of the MacDonalds, descended from Hector (Gaelic Eachann,) second son of Roderick MacDonald, 3rd of Moydart and Clanranald.

Numerous Scottish settlers settled along the east coast of the colonies that would become the United States and Canada. Others traveled to the open country of the west. At the time of the American War of Independence, some remained in the United States, while those who remained loyal to the crown went north to Canada as United Empire Loyalists. The highland games and clan societies that sprang up across North America in the 20th century have helped many Scots to recover parts of their lost traditions. Research into passenger and immigration lists has revealed some of the very first Cachias to arrive in North America: Joseph MaKecky (McGeachie), who arrived in Virginia in 1756; Thomas McKeachie, on record in America in 1797; Thomas McKeachy, who was in Ontario in 1844.

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